783 reputation
315
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location London, UK
age 24
visits member for 4 years, 1 month
seen 11 hours ago
I am currently in my final year of study for an undergraduate master's degree in maths at Imperial College, London. I seem to have been doing a surprising amount of geometry recently.

Apr
4
accepted ζ(-n) and “powers” of Grandi's series
Feb
26
asked ζ(-n) and “powers” of Grandi's series
Nov
9
comment Optimal inspection path on a sphere
I asked a more general version of this question here: mathoverflow.net/questions/22016/… Edit: incidentally, it's not completely obvious to me that γ(d) should be a spiral for small d.
Oct
30
comment Securing privacy of “who communicates with whom” under Orwell-like conditions
@GerhardPaseman, the question's asking about keeping "who's communicating with whom" private. If a package was being delivered by post, then finding out who sent and received it would not be difficult, unless you have some sort of routing protocol for post in mind (which, it seems to me, reduces the postal privacy problem to the online version). Also, post is quite a lot slower than the Internet, and not suitable for many purposes. Or have I misinterpreted your comments?
Oct
18
accepted Generalized Moore Graphs
Oct
17
comment Generalized Moore Graphs
Thanks. Can you give any details about the search algorithm you used, or is that still "under embargo" until you publish? Specifically, I'm interested in (1) whether there are any speedups beyond what's been known for decades, and (2) how long ago your study was - could we get better results with today's computers?
Oct
17
asked Generalized Moore Graphs
Oct
16
awarded  Popular Question
Oct
6
awarded  Caucus
Aug
25
comment How to find or constrain “particularly good” (two-sided) spectral expanders?
Thanks. Because I'm not familiar with the literature, it didn't occur to me that this would be a point of confusion. Done.
Aug
25
revised How to find or constrain “particularly good” (two-sided) spectral expanders?
Clarified what is meant by "two-sided expander"
Aug
25
comment How to find or constrain “particularly good” (two-sided) spectral expanders?
Just in case there's still any confusion: since λ1 is equal to k and hence fixed, a large spectral gap is equivalent to a small λ2. Such graphs are sometimes called one-sided expanders, to contrast them with two-sided expanders where both λ2 and -λn are small. For simplicity, I write λ simply to denote the maximum of λ2 and -λn.
Aug
25
comment How to find or constrain “particularly good” (two-sided) spectral expanders?
Sorry, perhaps my question is poorly typeset. There's a comma in the definition of λ; it should read max(λ2,-λn) i.e. the largest of the two eigenvalues in absolute value. Perhaps max(|λ2|,|λn|) would have been clearer.
Aug
24
asked How to find or constrain “particularly good” (two-sided) spectral expanders?
Jun
18
revised Manifold of immersions of a manifold
punctuation (missed full stop).
Jun
18
asked Manifold of immersions of a manifold
Jun
5
comment Delta-convex functions and inner products
As far as I can tell, yes (up to an affine function).
Jun
4
comment Delta-convex functions and inner products
Nevertheless, there are some functions for which a canonical choice does exist. For example, if f is a sum of functions of each component of x, then f can be decomposed componentwise (this covers quadratics, for example). Is that as far as we can go, or could there be a bigger space of functions with canonical decompositions?
Jun
2
comment Delta-convex functions and inner products
Thanks very much. However, I'm not quite clear how you're defining your example functional - I'm struggling to think of an interpretation which is both finite for functions such as quadratics, whose gradient is not globally BV, and also well-defined for arbitrary functions whose gradient is globally BV.
Jun
1
asked Delta-convex functions and inner products