bio  website  people.math.osu.edu/edgar.2 

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visits  member for  5 years 
seen  59 mins ago  
stats  profile views  6,803 
1d

asked  hypergeometric at nearest singularity 
2d

comment 
A criterion of norm null sequences in Banach space
More generally, in a metric space, a sequence $x_n$ converges to $y$ if and only if every subsequence of $x_n$ has a subsequence that converges to $y$. For topological space, you can do this with nets instead of sequences. 
2d

comment 
Is the notation ${}^t g$ for the transpose of a linear transformation intended to be suggestive?
I think the left t is the Bourbaki choice. 
2d

comment 
“Nice” functions on infinitedimensional space of germs of continuous functions at a point
You say "functionals" and not "linear functionals", right? 
Oct 16 
awarded  Yearling 
Oct 15 
comment 
Is the sequence of Apéry numbers a Stieltjes moment sequence?
I accepted this answer. But anyone reading should see the other answers, too, to get a full discussion. 
Oct 15 
accepted  Is the sequence of Apéry numbers a Stieltjes moment sequence? 
Oct 15 
comment 
Are Banach space norms (up to equivalence) unique?
... of course (as noted by Simon) that unbounded $\phi$ cannot be explicitly constructed. And cannot be constructed at all in simple ZF set theory. 
Oct 13 
comment 
the meaning of “Cauchy filter” for an arbitrary topological group
So, in fact, "Cauchy filter" is not standard in a general topological group. Instead, "left Cauchy" and "right Cauchy" filters are. 
Oct 12 
comment 
How do the compact Hausdorff topologies sit in the lattice of all topologies on a set?
For purposes of bestowing reputation, ask only one question per post. You are more likely to get answers rather than comments. 
Oct 11 
comment 
Another question on Borel sets and projections
Looks like Bob may find a book on descriptive set theory to be of interest. 
Oct 10 
awarded  Nice Answer 
Oct 9 
comment 
The Notion of Strong Measurability for Separable Banach Spaces
Yes, in complete measure space, you can redefine your approximations on a set of measure zero. 
Oct 3 
comment 
How to study analytically this ODE?
What do you mean by "analytical"? 
Sep 30 
awarded  Explainer 
Sep 22 
comment 
Characterization of a subset of [0,1] $II$
So, for example, you cannot have $t \in T$ but an interval $(t,t+\delta)$ disjoint from $T$, since there is no way for $t_n>t$ to converge to $t$. But perhaps that is the only restriction. 
Sep 19 
comment 
History of powers beyond squares and cubes
I read somewhere (maybe someone has a reference) that in the classical Greek geometry powers 4 and up never appear. Second power is area, third power is volume, and geometry is a theory to describe the real world, so higher powers are nonsense. Or something to that effect. 
Sep 17 
comment 
Errata database?
It's too bad this went away. You can still see it in web archives like the WayBack Machine. But the last update was 2007. A reason that errata lists should be in permanent places. 
Sep 14 
awarded  Nice Question 
Sep 13 
revised 
A hypergeometric puzzle
added 748 characters in body 