Timeline for A question about solutions to ordinary differential systems

12 events

when toggle format	what		by	license	comment
Jan 11, 2023 at 13:07	vote	accept	Raz Kupferman
Jul 5, 2022 at 10:05	history	edited	MyShepherd	CC BY-SA 4.0	deleted 2 characters in body
Jul 5, 2022 at 9:59	history	edited	MyShepherd	CC BY-SA 4.0	added 356 characters in body
Jul 5, 2022 at 4:37	history	edited	MyShepherd	CC BY-SA 4.0	added 10 characters in body
Jul 5, 2022 at 4:35	comment	added	MyShepherd		Thanks. You are right, but I was under the impression that @Raz Kupferman meant that $\\|{B}\\|<2$, since as your example shows otherwise the eigenvalues may be purely imaginary. In any event, I corrected the inequality by $P(\xi)\geq c\|\xi\|^{2}I$ for some constant $c>0$, this is all that is needed, I think.
Jul 4, 2022 at 19:21	comment	added	Iosif Pinelis		Concerning the inequality $\|\xi\|^{2}I\le P(\xi)$: If e.g. $\lambda=\xi_\mu=1$, $A=C=I$, and $B=2I$, then the inequality becomes $2I\le0I$, which is not true.
Jul 4, 2022 at 18:14	history	edited	MyShepherd	CC BY-SA 4.0	deleted 8 characters in body
Jul 4, 2022 at 17:42	history	edited	MyShepherd	CC BY-SA 4.0	added 1 character in body
Jul 4, 2022 at 17:36	history	edited	MyShepherd	CC BY-SA 4.0	added 198 characters in body
Jul 4, 2022 at 17:22	history	edited	MyShepherd	CC BY-SA 4.0	added 24 characters in body
Jul 4, 2022 at 17:16	history	edited	MyShepherd	CC BY-SA 4.0	added 24 characters in body
Jul 4, 2022 at 17:10	history	answered	MyShepherd	CC BY-SA 4.0