8,859 reputation
12774
bio website people.epfl.ch/willie.wong
location Lausanne, Switzerland
age 31
visits member for 4 years, 10 months
seen Dec 11 at 16:25
PostDoc at the PDE group at EPFL. I tend to like working with evolution equations from general relativity and Lagrangian field theories.

Dec
11
reviewed Close A sum-of-determinants identity
Dec
10
reviewed Close Finding conditions to guarantee existence of solutions to IVP
Dec
10
comment Finding conditions to guarantee existence of solutions to IVP
There are two parts to your question: (a) is the local existence, which is essentially addressed by Peano. (b) is the semi-global existence (solution exists for all $t\geq 0$), this is where conditions on $b(t)$ and $x_0$ seems to be more relevant. Can you please clarify your question?
Dec
10
reviewed Close Solution of a second order nonlinear ode
Dec
10
comment Can there be ordinals larger than those contained in Ord, and if so, can they be used to extend the constructible universe $L$?
@ThomasBenjamin: I hope you don't mind my editing. For the sake of those TL;DR-inclined, I moved your simplified question from the bottom of the post to near the top, where it would be more visible.
Dec
10
reviewed Leave Closed Have there been any new developments in the Firoozbakht conjecture?
Dec
10
reviewed Edit and Reopen Can there be ordinals larger than those contained in Ord, and if so, can they be used to extend the constructible universe $L$?
Dec
10
revised Can there be ordinals larger than those contained in Ord, and if so, can they be used to extend the constructible universe $L$?
added 12 characters in body
Dec
8
reviewed Close Which universities teach true infinitesimal calculus?
Dec
8
comment Which universities teach true infinitesimal calculus?
I've voted to close as off-topic as this question belongs better at matheducators.stackexchange.com
Dec
8
reviewed Close Continuously dependent on parameters
Dec
8
reviewed Close applications of C$^*$-algebras in the field of PDEs
Dec
5
revised Dichotomy for global existence or blow up for solutions of evolution problems
edited tags
Nov
24
reviewed Close Variation formula of a metric
Nov
20
reviewed Leave Open What makes the amenability of Thompsons group $F$ such a tricky problem?
Nov
20
comment “Almost” zeta function
@GHfromMO of course. Edited to incorporate your comment. (P.s. where I come from $\ll$ means something quite different and $\lesssim$ is usually used instead. I was honestly confused by your original comment.)
Nov
20
revised “Almost” zeta function
incorporated GH's comment
Nov
20
comment “Almost” zeta function
@GHfromMO: by $\ll$ you mean...?
Nov
20
answered “Almost” zeta function
Nov
20
comment “Almost” zeta function
Another typo: $$a_n < 1 \implies a_n^2 < a_n \implies n^{1 + a_n^2} < n^{1 + a_n} $$ so you probably want the two swapped in terms of convergence.