Tootfinder

Bridging Batch and Streaming Estimations to System Identification under Adversarial Attacks
Jihun Kim, Javad Lavaei
https://arxiv.org/abs/2509.15794 https://

Bridging Batch and Streaming Estimations to System Identification under Adversarial Attacks
System identification in modern engineering systems faces emerging challenges from unanticipated adversarial attacks beyond existing detection mechanisms. In this work, we obtain a provably accurate estimate of the Markov parameter matrix of order $k$ to identify partially observed linear systems, in which the probability of having an attack at each time is $O(1/k)$. We show that given the batch data accumulated up to time $T^*$, the $\ell_2$-norm estimator achieves an error decaying exponentia…

Exploring confinement transitions in $\mathbb{Z}_2$ lattice gauge theories with dipolar atoms beyond one dimension
Matja\v{z} Kebri\v{c}, Lin Su, Alexander Douglas, Michal Szurek, Ognjen Markovi\'c, Ulrich Schollw\"ock, Annabelle Bohrdt, Markus Greiner, Fabian Grusdt
https://arxiv.org/abs/2509.16200

Exploring confinement transitions in $\mathbb{Z}_2$ lattice gauge theories with dipolar atoms beyond one dimension
Confinement of particles into bound states is a phenomenon spanning from high-energy to condensed matter physics, which can be studied in the framework of lattice gauge theories (LGTs). Achieving a comprehensive understanding of confinement continues to pose a major challenge, in particular at finite matter density and in the presence of strong quantum fluctuations. State-of-the-art quantum simulators constitute a promising platform to address this problem. Here we study confinement in coupled …

A New Generalization of the Liouville-Jacobi Identity
Lubomir Markov
https://arxiv.org/abs/2507.14927 https://arxiv.org/pdf/2507.14927

A New Generalization of the Liouville-Jacobi Identity
A generalized Liouville-Jacobi Identity is proved for the determinant $\det{X(t)}$ of a solution $X(t)$ to the linear nonhomogeneous first-order matrix differential equation with left- and right-coefficient matrices $\ \frac{\rm d}{{\rm d}t} X(t) + A(t)X(t) + X(t)B(t)= F(t), \ X(t_0)=X_0.$

The Quantum Control Hierarchy: When Physics-Informed Design Meets Machine Learning
Atta ur Rahman, M. Y. Abd-Rabbou, Cong-feng Qiao
https://arxiv.org/abs/2509.12832 https://

The Quantum Control Hierarchy: When Physics-Informed Design Meets Machine Learning
We address a wide spectrum of quantum control strategies, including various open-loop protocols and advanced adaptive methods. These methodologies apply to few-qubit scenarios and naturally scale to larger N-qubit systems. We benchmark them across fundamental quantum tasks: entanglement preservation/generation, and directed quantum transport in a disordered quantum walk. All simulations are performed in a challenging environment featuring non-Markov colored noise, imperfections, and the Markov …

"Net immigration fell from around 800,000 in 2023 to around 400,000 in 2024. Yet when people were asked about this, only 8% thought that migration had decreased.
mainly macro: Key myths on asylum, immigration and how to take on the far right"
https://mainlymacro.blogsp…

A generalized Hurwitz stability criterion via rectangular block Hankel matrices for nonmonic matrix polynomials
Xuzhou Zhan, Zixiang Ni
https://arxiv.org/abs/2508.14376 https://…

A generalized Hurwitz stability criterion via rectangular block Hankel matrices for nonmonic matrix polynomials
We develop a Hurwitz stability criterion for nonmonic matrix polynomials via column reduction, generalizing existing approaches constrained by the monic assumption, as well as Gantmacher's classical stability criterion via Markov parameters. Starting from redefining the associated Markov parameters through a column-wise adaptive splitting method, our framework constructs two structured matrices whose rectangular Hankel blocks are obtained via the extraction of these parameters. We establish an …

"The UK’s actual record in the 1930s is far from good, but no doubt if Nigel Farage had been in power he would have eagerly sent every Jewish refugee fleeing from the Nazis back to Germany."
mainly macro: Key myths on asylum, immigration and how to take on the far right
https://

Bellman Optimality of Average-Reward Robust Markov Decision Processes with a Constant Gain
Shengbo Wang, Nian Si
https://arxiv.org/abs/2509.14203 https://a…

Bellman Optimality of Average-Reward Robust Markov Decision Processes with a Constant Gain
Learning and optimal control under robust Markov decision processes (MDPs) have received increasing attention, yet most existing theory, algorithms, and applications focus on finite-horizon or discounted models. The average-reward formulation, while natural in many operations research and management contexts, remains underexplored. This is primarily because the dynamic programming foundations are technically challenging and only partially understood, with several fundamental questions remaining…

I always see this headline and think, "surely they stopped sending sinners to Alcatraz long ago". But what do I know?
Alcaraz vs Sinner – US Open final: Match time, head-to-head, stats, Trump | Tennis News | Al Jazeera
https://www.

Alcaraz vs Sinner – US Open final: Match time, head-to-head, stats, Trump
All to know as the world’s top two men’s tennis players meet in New York in their third straight Grand Slam final.

Analysis and Design of Spare Strategy for Large-Scale Satellite Constellation Using Markov Chain
Seungyeop Han, Zachary Grieser, Shoji Yoshikawa, Takumi Noro, Takumi Suda, Koki Ho
https://arxiv.org/abs/2509.09957

Analysis and Design of Spare Strategy for Large-Scale Satellite Constellation Using Markov Chain
This paper presents a method for analyzing and designing an optimal spare-management policy in large-scale satellite constellations using a Markov chain model. To capture the stochastic nature of satellite failures and launch vehicle lead times, we adopt Markov chains to model both failure and replenishment processes. We reinvestigate an indirect spare strategy, modeled as a multi-echelon periodic-review reorder-point/order-quantity policy, in which spares are first delivered to parking orbits …