16

Answers
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0
Theorems that are ‘obvious’ but hard to prove
0
Most helpful math resources on the web
8
Does Physics need non-analytic smooth functions?
0
How is the physical meaning of an irreducible representation justified?
0
Does there exist a continuous function of compact support with Fourier transform outside L^1?
0
Examples of non-rigorous but efficient mathematical methods in physics
3
Examples of theorems with proofs that have dramatically improved over time
4
Open problems in PDEs, dynamical systems, mathematical physics
5
On the Paley-Wiener theorem
6
Projections in Banach spaces
4
Perturbations of an operator that disconnect the spectrum
2
Bounding a spectral gap: what proof techniques exist?
-1
Does a quantitative version of Fredholm theory exist?
2
quasinilpotence and finite spectrum
1
Quasinilpotent example
1
on an inequality of Brezis-Lieb