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20 votes
3 answers
690 views

Escaping from infinitely many pursuers

The fugitive is at the origin. They move at a speed of $1$. There's a guard at $(i,j)$ for all $i,j\in \mathbb{Z}$ except the origin. A guard's speed is $\frac{1}{100}$. The fugitive and the guards ...
Eric's user avatar
  • 2,619
2 votes
0 answers
108 views

Does a smooth dynamical system always come with a metric

Warning: My education in formal mathematics is very weak so I apologize for any confusions/errors in the following, please don't hesitate to correct me. Question: Consider a smooth dynamical system $...
Sujaan's user avatar
  • 21
2 votes
0 answers
191 views

Geometric properties of solutions of Hamiltonian system

Context : We are interested in the following dynamic with state $(q,\varphi)$ $$ \dot q = \varepsilon F(q,\varphi), \quad \dot \varphi = \omega(q) + \varepsilon G(q,\varphi) $$ ($\varepsilon >0$ ...
Smilia's user avatar
  • 141