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visits member for 5 years, 5 months
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23h
revised Hausdorff measure of the graph
added 108 characters in body
23h
answered Hausdorff measure of the graph
Mar
24
comment Dual space of $l^p(\mathbb{Z},X)$
A table of duals of common spaces is found in Dunford & Schwartz, volume 1.
Mar
23
answered Is there any simpler form of this function
Mar
23
comment What is the value of the infinite product: $(1+ \frac{1}{1^1}) (1+ \frac{1}{2^2}) (1+ \frac{1}{3^3}) \cdots $?
Value 2.60361190459951423330221282635 is not known to isc.carma.newcastle.edu.au
Mar
21
comment Is there a natural bijection from $\mathbb{N}$ to $\mathbb{Q}$?
It maps only to $\mathbb Q^+$ ? Is that your objection?
Mar
14
comment Is this apushout diagram
Reading your title made me wonder why Apu is shouting.
Mar
10
comment Generating function for reciprocals of Stirling numbers?
No, in general there is no reasonable way to find the generating function of the reciprocals of a sequence, knowing only the generating function of the sequence.
Mar
3
comment Does ZF prove that topological groups are completely regular?
Would it be interesting to come up with a model of ZF and a topological group there that is not completely regular.
Feb
26
comment Who coined “mob” and “clan” and why these words?
"Group", "family", "collection" have already been used. Bourbaki used tribu ("tribe"), but that did not catch on outside French-speakers. So Alexander just used some other words for organization.
Feb
25
comment Self-dual normed spaces which are not Hilbert spaces
The Denis unit ball is a square, but the unit ball for any two-dimensional Hilbert space is an ellipse. So the Denis space is not isometric to a Hilbert space. (It is, of course, linearly homeomorphic to a Hilbert space.)
Feb
24
awarded  Popular Question
Feb
20
answered What is $\sum_{i=0}^{n}\binom{n}{i}^3$?
Feb
20
awarded  Necromancer
Feb
20
answered What is a Kelley ring?
Feb
18
revised Maximal ideals of the algebra of measurable functions
added 24 characters in body
Feb
10
comment Are $L^\infty(\Bbb R)$ and $L^2(\Bbb R)$ homeomorphic?
We need answers, since comments are likely to go away in the future.
Feb
10
comment Are $L^\infty(\Bbb R)$ and $L^2(\Bbb R)$ homeomorphic?
Maybe check your explicit homeomorphism $L^p(\Bbb R) \to L^q(\Bbb R)$ more carefully.
Feb
8
comment Non-reflexive Banach space s.t. X,X*,X**,… are separable
Yes, James space has $X^{**}/X$ of dimension $1$. For example en.wikipedia.org/wiki/James%27_space Also mathoverflow.net/a/43987/454
Feb
6
comment Is it possible to get an equation with two exponentials and a bessel function in closed form?
Maple fails to find closed form in case $a=b=1,n=2$. It does $n=1$.