rubenvb
Reputation
327
Top tag
Next privilege 500 Rep.
Access review queues
 Apr 20 awarded Famous Question Apr 5 comment Is a continuous function plus a discontinuous function discontinuous? Wouldn't the domain without 0 lead to an "almost everywhere" continuity, as there is no way to formulate an epsilon-delta continuity construction for a gapped domain? Mar 23 comment What does a tilde underneath an inequality mean? @C.Dubussy This does answer the question and is exactly how I would interpret this kind of expression. Granted, that's from a physics perspective. In short, it's a mix of $\simeq$ or $\approx$ with $<$. Mar 6 comment Correct set notation for “all integers which are not multiples of 7”? This is also very succint and clear. +1 Jan 21 comment Number of non-identity, self-inverse elements in an Abelian group of order 10 I'm not a mathematician and I fail to see how this answers the question. Nov 10 awarded Popular Question Oct 15 comment Computing $\lim_{x→\infty}\ln(3x ^2 − 4x + 2) − \ln(5x ^2 + 19x − 1)$ The "swapping" of $\ln$ and $\lim$ is only allowed if the resulting limit converges, not just because $\ln$ is continuous! Sep 3 awarded Notable Question Aug 8 awarded Popular Question Jul 29 awarded Citizen Patrol Jul 29 comment When I was teaching absolute function properties, I suddenly made this question … @Khosrotash It makes people that didn't see this immediately, feel dumber than the rest. May 27 comment Is there such a thing as complex rational numbers and does it have the same properties as the usual complex numbers as extension of the real numbers? @AlexR Could is be used to say, define useful quantum physics, and would the limitations of the field $\mathbb{Q}(\mathrm{i})$ be in any way meaningful when interpreted physically? May 26 asked Is there such a thing as complex rational numbers and does it have the same properties as the usual complex numbers as extension of the real numbers? Oct 17 comment Limit of a 0/0 function A hard requirement of the usability of l'Hôpital's rule is that the resulting "right-hand-size" is exists. But I guess that's what Hans is saying in more fancy terms? Jul 2 awarded Curious Jul 2 awarded Excavator Jul 2 revised Finite element method for the 'Particle-In-a-Box' problem in quantum mechanics corrected code formatting Jul 2 suggested approved edit on Finite element method for the 'Particle-In-a-Box' problem in quantum mechanics May 12 comment How is the multiplicity of a pole defined when square roots are involved? Yes, of course, never cross the branch cut, but I'll need to calculate a limiting small circle integral around that point from one side of the cut to the other if I'm to avoid them, My question is more about that than the real residue which is defined differently for these points if it even exists. May 12 revised How is the multiplicity of a pole defined when square roots are involved? added 95 characters in body