Existence of Lyapunov functions of variable sign for linear extensions of dynamical systems on a torus
2014 ◽
Vol 66
(4)
◽
pp. 617-624
◽
2016 ◽
Vol 67
(10)
◽
pp. 1527-1536
◽
2007 ◽
Vol 59
(4)
◽
pp. 546-562
◽