The Hala Attractor Chaotic System

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The Hala Attractor Chaotic System: Comparison

Please note this is a comparison between Version 16 by Ahmed M. Hala and Version 15 by Ahmed M. Hala.

The Hala attractor (جاذب حلا) is a self-regulating chaotic system, while the modified Hala attractor is a model that bridges the gap between dissipative chaos and an ideal Hamiltonian-like chaotic system. The hybrid version of the Hala attractor is a spatiotemporal formulation that is explained in this entry in the context of probing a physical plasma system in comparison with the experimental Langmuir probe I-V characteristics trace. Even though the attractor original formulation was for introducing a damping term to a Lorenz-like attractor, application of the Hala chaos control term in that formulation proved to be a universal operator that compresses chaos discretely and control it across many types of chaos attractor systems. Further, a robust technique was developed to introduce a process, the Successive Controlled Collapse (SCC), to irreversibly discretize the continuous Hala attractor for programmable applications as well as introducing reversible, and partially reversible, chaos control mechanisms for two distinct chaotic host classes turning the chaotic attractor into a fixed-point or a limit cycles. The creator of the Hala attractor is Dr. Ahmed M. Hala (الدكتور أحمد معتوق حلا).

Chaos theory
Fixed point theory
Bifurcation
Plasma physics
Chaos compression
Hala operator
Discretization
Braiding
Reversible control
Control

1. Introduction

The body of research on the Hala Attractor represents a contribution in the field of nonlinear dynamics and chaos theory. It highlights a different treatment than the conventional view of chaos as an intrinsic, uncontrollable feature of certain systems, instead reframing it as a tunable, controllable property. This cohesive research direction, spanning three studies, demonstrates that chaos is not a binary, all-or-nothing state but rather a gradient that can be systematically regulated. Through a blend of successive theoretical refinements and empirical validation, particularly in the realm of plasma physics, the work indicates that chaotic behavior can be controlled via specific parameters, external forcing, spatial context, and even measurement perturbations. In addition, this innovative perspective reconciles dissipative and Hamiltonian views of chaotic systems, offering a new perspective through which to interpret and control complex dynamical behaviors.

2. History and Theoretical Development

The historical progression of the Hala attractor framework is marked by a series of logical and cumulative theoretical advances. The initial study ^[1] introduced the Hala Operator by modifying a classic Lorenz-type ordinary differential equation system. The key innovation was the incorporation of this Hala Operator nonlinear feedback term, quantified by a quenching factor $γ. The set of equations of the Hala Attractor Chaotic System is:$

Where the Hala Operator is acting on the z-axis direction and is defined as:

Numerical simulations and analysis of the largest Lyapunov exponent revealed that as $γ$ increases, the system undergoes a continuous transition—through a series of bifurcations—from chaotic strange attractor behavior to stable fixed points. This finding demonstrated that the chaotic regime could be collapsed with only small changes in a single parameter, proving that chaoticity is not an intractable attribute but a gradient property.

Figure 1. Visualizing Symmetry-Breaking and Manifold Collapse - Phase-space projections highlighting the structural versatility of the Hala Attractor under varying operational states:

$\gamma = 0.0$ : The fully developed chaotic attractor. While superficially resembling classical dual-lobe flows, it lacks rotational symmetry, featuring localized state-dependent phase compression.
$\gamma = 0.0001$ : Micro-feedback initiation. The operator breaks the spatial topology, pinching the trajectories along an explicit, directional vector and compressing the multi-layered manifold toward a dense nodal origin.
$\gamma = 0.01$ : Operating deep within the negative Lyapunov regime (λ₁ $\lambda_1 \approx -0.73$ ), the Hala Operator has executed a reduction in dimensionality. The chaotic attractor is completely suppressed, mapping all initial trajectories onto a singular, stable focal point.

Figure 2. Quantification of Phase-Space Stabilization via the Hala Operator. These plots track the Largest Lyapunov Exponent (λ₁) as a function of the internal control feedback parameter ( $γ$ ). For γ ∈ [0.0, 0.0065], the system maintains a robust chaotic regime (λ₁ $\lambda_1 > 0$ ), exhibiting a slow, controlled degradation of structural divergence. At the critical threshold of $γ$ ≈ $\gamma \approx 0.0068$ , the system experiences an abrupt topological turn—a sharp, discontinuous drop across the zero-boundary line (red dashed line). For $γ$ $\gamma > 0.0068$ , λ₁ becomes strictly negative (λ₁ $\lambda_1 < 0$ ), empirically demonstrating the onset of a discretizing protocol where chaotic degrees of freedom are fully dissipated into a stable, non-injective manifold.

The second work ^[2] expanded this foundation by adding a crucial dissipation parameter, δ, and an external periodic forcing term with adjustable amplitude and frequency. This theoretical expansion was designed to explore the intricate interplay among dissipation, resonance, and chaos. By manipulating these parameters, the system could be made to interpolate between strongly dissipative behavior, where phase space volumes contract significantly, and Hamiltonian-like (nearly volume-preserving) behavior. The analysis of the Lyapunov spectra, phase space trajectories, and measures of volume contraction showed a remarkable result: as dissipation was reduced toward zero, the system's phase space contraction vanished, yet the largest Lyapunov exponent remained positive. This demonstrated the persistence of chaotic behavior even in the Hamiltonian limit, where energy is conserved. External forcing, meanwhile, yielded distinct resonant phenomena, which are vital for modeling physical processes such as plasma heating, where energy exchange via resonance is paramount.

The third study ^[3] tied these theoretical advances to real-world phenomena through empirical validation. Most commonly found experimental current-voltage (I-V) traces obtained from Langmuir probes in quiescent plasma were considered, specifically in the electron saturation region. Through quadratic fitting of this region, a discrete recurrence relation was extracted whose bifurcation diagram displayed a classic period-doubling cascade culminating in a chaotic regime. In addition, a spatial dependence was observed, with chaos manifesting more strongly at the magnetically confined plasma boundary and relative order or stability in the quiescent bulk. Furthermore, temporal transitions were observed when the diagnostic probe actively perturbed the system, acting as a form of measurement intrusion. It was shown then that a suitably parameterized Hala attractor model could reproduce all these behaviors, including the fixed point → limit cycle → period-doubling → chaos route, as well as hysteresis effects in the I-V curves. This empirical match provided compelling evidence for the model's utility and the theoretical framework's ability to interpret and predict real-world plasma phenomena.

3. Deterministic Control and Numerical Dynamics via Successive Controlled Collapse (SCC)

The Hala Attractor can undergo a deterministic control protocol termed Successive Controlled Collapse (SCC), wherein brief activation of the nonlinear feedback parameter $γ$ $\gamma > 0$ through a smooth sigmoidal ramp forces chaotic trajectories to collapse onto target fixed points in a globally contracting manner. By repeatedly applying this controlled pulse separated by a free-evolution interval $T_{\text{free}} = 50.0$ , the protocol generates infinite families of strictly discrete, non-overlapping landing points that faithfully map the geometry of the original strange attractor. A rigorous uniqueness proof ensures that no two landing points coincide under non-identical pulse timing sequences, effectively mapping the continuous chaotic flow into a programmable, discrete-chaotic state compressor machine.

The stability and existence of the underlying fixed points during feedback parameter variation are captured in the equilibrium continuation diagram (Figure 3). Tracking the fixed-point branches $(x^*, y^*, z^*)$ against $γ$ reveals that the system's structural symmetry $x^* = y^*$ is strictly preserved throughout the continuation process. While the vertical coordinate remains stationary at $z^* = 27$ , $x^*$ and $y^*$ asymptote sharply toward infinity as $γ$ approaches the critical fold threshold:

\gamma_c = \frac{1}{54} \approx 0.0185

Beyond this theoretical critical boundary, real, non-trivial equilibrium branches cease to exist within the symmetric ansatz. Trajectories subjected to parameter shifts near or past this threshold no longer relax to static equilibria but are instead governed by transient manifold dynamics.

Figure 3: Equilibrium continuation of the Hala-Lorenz system as a function of the control parameter $γ$ . The fixed-point branches $(x^*, y^*, z^*)$ illustrate strict preservation of the structural symmetry $x^* = y^*$ , with $z^* = 27$ remaining invariant across the sweep. As the control parameter approaches the theoretical fold threshold $γ c$ ≈ 0.0185 (red dotted line), $x^*$ and $y^*$ asymptote toward infinity, marking the critical limit past which real non-trivial equilibrium branches cease to exist within the symmetric ansatz.

The continuous trajectory evolution during the uncontrolled phase is evaluated in the preliminary SCC comparison (Figure 4). Varying the free-evolution interval highlights the intrinsic dissipative properties of the flow under periodic switching:

Short Evolution Interval ( $T_{\text{free}} = 50.0$ $T_{\text{free}} = 5.0$ ): Trajectories retain residual kinetic displacement from the preceding parameter pulse, resulting in a broader spatial dispersion of landing points that highlights transient manifold structures.
Extended Evolution Interval ( $T_{\text{free}} = 50.0$ $T_{\text{free}} = 50.0$ ): Trajectories experience prolonged physical phase-space volume contraction, pulling landing points into significantly tighter clusters along the local manifold domain.

This spatial condensation across larger values of ( $T_{\text{free}} = 50.0$ $T_{\text{free}}$ represents true physical relaxation along the stable manifold, confirming that longer evolution times allow the controlled system to settle closer to its asymptotic invariant sets.

Figure 4: Phase-space volume contraction under the Successive Controlled Collapse (SCC) protocol. Side-by-side comparison of landing point constellations evaluated at short ( $T_{\text{free}} = 50.0$ $T_{\text{free}} = 5.0$ , left) and extended ( $T_{\text{free}} = 50.0$ $T_{\text{free}} = 50.0$ , right) free-evolution intervals, alongside the hypothesized ghost target region (cyan marker). Shorter evolution intervals capture transient dispersion caused by residual pulse energy, whereas prolonged free evolution permits physical phase-space volume contraction, drawing trajectories into tighter clusters along the invariant manifold.

Applying uncalibrated control pulses introduces severe stiff numerical dynamics into the flow integration, as demonstrated in Figure 5. When the pulse amplitude is set far past the fold threshold ( $γ on$ $\gamma_{\text{on}} = 0.14$ ), the quadratic feedback term $-2\gamma x y z$ in $\dot{z}$ (dot z) induces localized stiffness. Without adaptive step-size controls, state clipping, or domain bounding, trajectories escape the bounded phase space along vertical linear towers, driving the vertical coordinate beyond $Z > 10^5$ . This instability underscores a core operational requirement for the SCC protocol: to maintain bounded discretization and prevent numerical solver divergence during active switching cycles, the pulse amplitude $γ c$ must be calibrated relative to the fold boundary $γ c$ , or explicit bounding limits must be imposed on the nonlinear feedback operator.

Figure 5: Numerical stiffness and trajectory escape under uncalibrated control pulses $γ c$ ≈ 0.0185. Demonstration of solver instability during unconstrained switching cycles across $T_{\text{free}} = 50.0$ $T_{\text{free}} = 5.0$ (left) and $T_{\text{free}} = 50.0$ $T_{\text{free}} = 50.0$ (right). Applying a pulse amplitude far exceeding the fold boundary causes the nonlinear feedback term $-2\gamma x y z$ to induce localized stiffness, driving trajectories out of the bounded phase space along vertical manifold towers ( $Z > 10^5$ ) and demonstrating the necessity of pulse calibration.

In this context, a "ghost point" (or ghost bottleneck) refers to a localized phase-space region where a stable equilibrium used to exist before being annihilated by a fold bifurcation, causing passing trajectories to temporarily stall as if an attractor were still present.

Here is the exact dynamical mechanism behind it in the Hala-Lorenz system:

Annihilation at the Fold: As the control parameter $γ$ ramps continuously past the critical threshold $γ c$ ≈ 0.0185, the non-trivial symmetric fixed-point branch terminates. Past this point, the static equilibrium no longer exists in the differential equations.
Critical Slowing Down: Although the fixed point disappears for $γ >$ $γ c$ , the phase-space velocity $\dot{\mathbf{x}}$ near its former coordinates—specifically around $(6.56, 5.56, 27)$ —remains exceptionally close to zero. This localized region acts as a severe dynamical bottleneck.
Transient Trapping in SCC: When the SCC protocol applies a continuous sigmoidal parameter ramp with a short free-evolution interval ( $T_{\text{free}} = 50.0$ $T_{\text{free}} = 5.0$ ), trajectories adiabatically tracking the system get caught in this low-velocity zone. Because they spend a disproportionate amount of time traversing this region before integration ends, the recorded landing points form a tight visual cluster (represented by the cyan marker in your figures).

It is termed a ghost because it "haunts", figurately speaking, the phase-space coordinates of an annihilated state: it creates the visual and structural illusion of a static attractor over short observation windows but disappears when trajectories are given sufficient time ( $T_{\text{free}} = 50.0$ ) to escape the bottleneck and relax onto true asymptotic invariant sets.

4. The Hala Attractor Chaotic System Universality

The Hala operator’s universality role within its chaotic system is supported by direct computation rather than a single system citation. Ten of eleven canonical systems quench under the operator’s canonical form; the eleventh does not, for a mechanistically understood reason that generalizes into a concrete axis selection procedure applicable to any future host. The operator’s own sigmoidal control protocol, previously an external schedule, is shown to be the exact solution of a logistic equation, allowing the entire construction to be recast as a single autonomous four-dimensional system whose chaotic-to-quenched transition is, with quantified limitations, detectable from within its own dynamics ^[4].

Table 1: Expanded mechanism table: divergence structure, equilibrium persistence, and the verified long-horizon behavior of γ on all eleven canonical hosts–not merely whether λ1 crosses zero, but what the trajectory actually does once it has.

Framed this way, the Hala attractor is no longer merely an operator applied to a host system with an externally chosen γ; it is a self-contained four-dimensional dynamical system whose own trajectory carries it from strange-attractor dynamics to a quenched register, with the capacity– imperfect, but real– to detect that transition from within its own dynamics rather than requiring an external parameter sweep. This is the sense in which “universality” and “self-regulation,” previously used somewhat loosely in the original manuscript, can be made precise: universality is now a per-host axis-diagnosis procedure rather than a fixed rule, and self-regulation is now a literal 6 autonomous property of a single augmented flow rather than a description of externally-swept

behavior.

Figure 6: The Hala Operator quenching across benchmark systems

Because the factor γ’s dynamics are autonomous and decoupled from (x , y , z), a single realization of the coupled flow sweeps through the chaotic-to-quenched transition along its own trajectory. It was tested whether this transition is detectable online, using a sliding-window, multi-direction two trajectory Lyapunov estimate computed continuously as the trajectory evolves (three independent perturbation directions, renormalized every 1.6 time units, run on the Lorenz host with γ base = 0, γ target = 0.01, k = 0.3). The local estimate does correctly detect the transition– it settles reliably negative once γ(t) is well past threshold.

Figure 7: Top: the autonomous logistic state γ(t), compared to the externally determined static

threshold γc ≈ 0.00176. Bottom: the online local Lyapunov estimate (raw, 3-direction average, and

smoothed), which settles reliably negative only well after γ(t) has crossed the static threshold.

5. The Hala Attractor as a Chaos Controlling Mechanism

Whereas the SCC protocol is an irreversible discretizing protocol, there exist other mechanisms to a reversible, or partially reversible, control for chaos via the Hala Attractor Chaotic System. One such control process first contracts the chaotic trajectory onto a lower-dimensional invariant state, terminating at a stable fixed point in the Lorenz system and at a stable limit cycle in the Sprott A system. Reversing the control subsequently reintroduces phase-space expansion, allowing the trajectory to evolve back toward its original attractor. Figures 8 and 9 show that the reconstructed Lorenz attractor closely matches the original butterfly geometry, indicating near-complete geometric reversibility, whereas the recovered Sprott A attractor preserves its characteristic multi-loop topology but exhibits phase-slip and incomplete temporal reconstruction. These observations indicate that the attainable degree of reversibility is governed by the underlying attractor structure, with equilibrium-based systems recovering more faithfully than hidden attractors lacking stable equilibria ^[5].

Figure 8. Reversible control of the Lorenz attractor showing the transition from chaos to a stable fixed point and subsequent recovery of the butterfly attractor with high geometric fidelity.

Figure 9. Partial reversible control of the hidden Sprott A attractor showing the transition from chaos to a stable limit cycle and subsequent recovery of the attractor with preserved topology and observable phase-slip.

In addition, and unlike the previously described mechanism, the control objective in this other mechanism is not to reconstruct a previously collapsed attractor but to counteract the collapse mechanism itself by periodically restoring local instability as nonlinear dissipation increases ^[6]. The geometric modulation repeatedly reorients trajectories toward expanding directions of the flow, delaying the loss of chaotic stretching and broadening the critical transition between chaos and order. This behavior is evidenced by the upward shift of the largest Lyapunov exponent, its delayed zero-crossing, and the widening of the critical transition region shown in figures 10 and 11.

Figure 10. Topological braiding delays the onset of chaotic collapse by preserving positive Lyapunov growth over an extended control-parameter range.

Figure 11. Braiding-induced restoration of local chaotic stretching broadens the critical transition region and produces intermittent dynamical rescue near collapse.

The corresponding phase-space trajectories in figures 12–15 demonstrate that the Lorenz system retains a braided chaotic attractor, whereas Sprott A evolves into a braided quasi-periodic limit cycle instead of collapsing directly to a lower-dimensional state. The results therefore support "partial reversible" control of the collapse dynamics, whereby the onset of stabilization is locally and temporarily reversed through repeated restoration of chaotic stretching, rather than through reconstruction of an already stabilized attractor.

Figure 12. Partial reversible control of the Lorenz attractor through topological braiding preserves a braided chaotic state under increasing nonlinear dissipation.

Figure 13. Nonlinear dissipation drives the hidden Sprott A attractor toward a stable limit cycle, establishing the baseline controlled state prior to braiding.

Figure 14. Topological braiding partially reverses collapse in the Sprott A system by transforming the controlled limit cycle into a braided quasi-periodic attractor.

Figure 15. Poincaré analysis confirms the persistence of organized braided dynamics and periodic structure following partial reversal of collapse.

6. Applications and Broader Implications

The collective work on the Hala attractor opens up an important implications and applications. The central tenet—that one can engineer systems whose chaoticity is under control—has relevance in numerous domains beyond plasma physics.

Plasma Physics: The ability to control chaotic behavior is fundamental to understanding and manipulating wave-particle interactions, plasma heating mechanisms, and instabilities. It also holds promise for mitigating boundary phenomena in fusion devices, a critical challenge in the quest for clean energy.
Secure Communications: Chaos can be harnessed for encryption or masking signals due to its inherent unpredictability and sensitivity to initial conditions. Chaotic signals can be used as carriers for secure data transmission, a field known as chaos-based communication. Related literature supports this potential, with optomechanical systems showing that modulated coupling can enable a switch between chaotic and regular behavior, suggesting applications in low-power optical secure communication.
Random Number Generation: Micromechanical and nanomechanical resonators under nonlinear driving can be pushed into chaotic oscillation regimes through amplitude or frequency modulation. This chaotic output can be converted into high-quality True Random Number Generators (TRNG), which are essential for cryptography and computational simulations.
Mixing and Fluid Dynamics: In industrial and chemical engineering, controlled chaos can be used to optimize mixing processes, ensuring uniform distribution of substances and enhancing reaction efficiency.
Biological and Biomedical Systems: The principles of tunable chaos could be applied to models of biological systems, from heart rhythms to neural networks, to better understand and potentially control pathological states that involve erratic or chaotic dynamics.
For equilibrium-based chaotic systems (Lorenz class): High-fidelity reversible control enables switchable operation between chaotic exploration and stable equilibrium, making it attractive for secure communications, adaptive sensing, autonomous robotics, and nonlinear controllers that require reliable recovery of the original chaotic dynamics after temporary stabilization.
For hidden-attractor systems: Partial reversible control provides a mechanism for delaying or modulating collapse while preserving essential attractor topology, offering new strategies for resilience enhancement, critical-transition mitigation, and adaptive operation in nonlinear networks, neuromorphic systems, plasma dynamics, and other complex systems where exact trajectory reconstruction is inherently unattainable.

7. Limitations and Future Directions

Despite these important contributions, the body of research acknowledges several limitations and outlines a clear path for future research. Most analyses to date have focused primarily on the largest Lyapunov exponent, rather than the full Lyapunov spectra. A more complete understanding of the system's dynamics requires mapping all exponents and relating them to the attractor's dimensionality. The detailed fractal dimension (e.g., Kaplan-Yorke dimension, Hausdorff dimension) of the strange attractors under varying parameters has not yet been fully mapped, which is essential for characterizing their complexity.

Further, the Hala attractor framework introduces a universal operator that treats chaos as a controllable resource by applying internal, state-dependent feedback to a dynamical system's stretching direction. Rather than relying on external interventions, this method utilizes a specific damping term that is weak near the origin but becomes dominant during large movements, effectively stabilizing the system's unstable saddle-foci. This process follows a consistent three-tier hierarchy across various chaotic regimes, ranging from the tuning of local stability to the total collapse of chaotic dimensions into stable fixed points. Ultimately, the framework demonstrates that complex chaotic behaviors in systems like plasma dynamics or atmospheric models can be deterministically programmed and suppressed, recasting chaos as a tunable asset for computational and physical applications .

Moreover, the current models are low-dimensional and idealized. Real plasma systems are spatially extended, noisy, heterogeneous, and subject to measurement back-action and perturbations. A deeper study is needed to assess the robustness of chaos tunability under these realistic conditions. The precise thresholds for bifurcations in terms of $γ$ , δ, and external forcing parameters are currently determined numerically, and rigorous theoretical or analytical proofs are lacking. From the empirical side, more extensive measurements of spatial and temporal variation, higher-resolution diagnostics, and controlled experiments that systematically vary the parameters corresponding to the model would greatly strengthen validation.

In addition, the reversibility control mechanisms are demonstrated for two representative low-dimensional chaotic systems, with reversibility evaluated primarily through qualitative phase-space reconstruction and Lyapunov-based indicators; quantitative trajectory-recovery metrics, robustness to noise and parameter uncertainty, and validation on higher-dimensional or experimentally realized chaotic systems remain to be established.

Looking ahead, future work should aim to:

Advanced Theoretical Analysis: Computing the full Lyapunov spectrum across the parameter space and relating it to attractor dimensionality and complexity.
Higher-Dimensional Models: Extending the models to spatially extended, high-dimensional systems (e.g., partial differential equations) to better mimic realistic plasma behavior.
Noise and Perturbation Studies: Systematically investigating the effects of stochastic perturbations, measurement noise, and probe-induced perturbations. This could be inspired by quantum-chaos literature, which shows that the measurement strategy itself can act as a control parameter.
Control Strategies: Investigating robust control strategies for chaos—how to reliably suppress it or trigger it—in engineered systems.
Thermodynamic Considerations: Exploring thermodynamic and entropy considerations, especially near the Hamiltonian limits, to understand the energy implications of controlling chaos.
Practical Prototype Development: Pursuing the development of practical prototypes in fields like controlled plasma heating, boundary instability mitigation in fusion devices, secure communications, and random number generation to translate the theoretical findings into tangible technologies.
Developing control strategies: For hyperchaotic, networked, and experimentally accessible systems, develop quantitative measures of reversible recovery and partial reversibility, and investigate adaptive, data-driven implementations capable of real-time stabilization, recovery, and resilience enhancement in complex nonlinear dynamical systems.

References

Ahmed Hala. The Hala Attractor: A Self-Regulating Chaotic System. HAL Open Science. 2025, HAL Id : hal-05202097 , version 1, https://hal.science/hal-05202097.
Ahmed Hala. The modified Hala attractor: a model to bridge the gap between Hamiltonian and dissipative chaos in plasma systems. HAL Open Science. 2025, HAL Id : hal-05203110 , version 2, https://hal.science/hal-05203110.
Ahmed Hala. The Hala Attractor: Experimental observation and theoretical modeling of spatiotemporal chaos in quiescent Plasma. HAL Open Science. 2025, HAL Id : hal-05202098 , version 1, https://hal.science/hal-05202098.
Ahmed M. Hala “Universality of the Hala Attractor Chaotic System and the Hala Operator as a Standalone Autonomous 4D Flow” (2026) https://doi.org/10.5281/zenodo.21693991.Ahmed M. Hala, “State-Dependent Feedback Dynamic Systems Operator: Mechanisms of Intrinsic Quenching, Dimension Reduction, and Global Universality in Chaotic Manifolds” (2026) https://doi.org/10.5281/zenodo.21704708.
Ahmed M. Hala “Hybrid Reversible Chaos Control: Triple Hala Operator with Adaptive Reversible Expansion and Harmonic Anchoring for Lorenz and Sprott A Attractors” (2026) https://doi.org/10.5281/zenodo.20261696.
Ahmed M. Hala "Multi-Dimensional Control and Topological Braiding of Chaotic Attractors: Extending the Hala Operator with Design of Experiments and Hybrid Feedback" (2026) https://doi.org/10.5281/zenodo.20255928

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