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Oct
3
answered Why proof by induction is working.
Oct
2
comment Determinant of a specially structured matrix
Can't you put $\mathbf u:=\mathbf e$ and $\mathbf v:=b\mathbf e$ (or vice versa) to avoid the radicals?
Oct
2
comment Is the subspace of $ C_0 $ open in $ L^\infty $?
+1 You managed to give the simplest argument of all of us :-)
Oct
2
comment Is the subspace of $ C_0 $ open in $ L^\infty $?
Which metric you assume, the one of $L^\infty$, i.e., the maximum one, right?
Oct
1
revised Show that max $\{f,g\}$ is continuous
deleted 295 characters in body
Oct
1
comment Finding the value of the series $(n-1)(n-2)(n-3)…\infty$
-1 This is way beyond acceptable notation. Remember that sloppiness in sums can lead to results like that $1+2+3+4+5+\dotsb = 1/12$. You need to very carefully specify what you do.
Oct
1
answered Show that max $\{f,g\}$ is continuous
Oct
1
awarded  Yearling
Sep
23
awarded  Tumbleweed
Sep
19
comment Why does the solution set for this inequality turn out this way?
Ahem try this with a 5-variable inequality ;-) While this works on the "maternity school level", anywhere higher up you shall go the rigorous way. This answer is not quite general, it works only for 1-variable inequalities with continuous functions.
Sep
14
comment Isolating Decimals
Note that people who need this a lot often denote it $\{x\}\mathrel{:=} x-\lfloor x\rfloor$ (of course, they mention this notation in the preliminaries because it's considered non-standard).
Sep
14
comment Why is Lebesgue so often spelled “Lebesque”?
It's all because French has too complicated spelling :D
Sep
13
comment Who decides after whom a theorem or conjecture is named?
AFAIK, Berry's paradox was stated by Arnold :)
Sep
8
revised limit calculation to infinity 123
improved formatting
Sep
8
answered prove that $\forall N \in \mathbb{N}$, there is a $n\in N$ such that the prime gap $g_n = p_{n+1} - p_n$ > N.
Sep
8
comment limit calculation to infinity 123
@lulu We seem to have submitted a similar edit simultaneously, but I don't have the edit privilege yet. Could you please check everything is ok? Feel free to reject my edit if it's better to do so.
Sep
8
suggested approved edit on limit calculation to infinity 123
Sep
8
asked Canonical number systems reference request
Sep
1
revised 1, 5, 9, 13, 17, 21,…
edited body
Sep
1
answered 1, 5, 9, 13, 17, 21,…