Paul Johnson

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1,402 reputation

712

bio	website	www2.imperial.ac.uk/~pjohnso1
	location	London
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visits	member for	4 years, 4 months
	seen	7 hours ago
stats	profile views	812

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19 Answers

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17	how does one understand GRR? (Grothendieck Riemann Roch)
17	Products of Conjugacy Classes in S_n
8	Virasoro constraints for the generating function of Hurwitz numbers.
8	Gromov-Witten and integrability.
7	Examples of “folk theorems”

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1,402 Reputation

+30	How “accidental” are equalities between parts of Ehrhart quasi-polynomials? When do they persist to Euler-Maclaurin?
+30	computing monodromy of branched cover of sphere specified by a polynomial
+35	Where does the notation $\pi_1(X,x)$ for the fundamental group first appear?
+10	Intuition behind the age grading in quantum cohomology of orbifolds

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5 Questions

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23	Nearly all math classes are lecture+problem set based; this seems particularly true at the graduate level. What are some concrete examples of techniques other than the “standard math class” used at the Graduate level?
12	A natural refinement of the $A_n$ arrangement is to consider all $2^n-1$ hyperplanes given by the sums of the coordinate functions. Have you seen this arrangement? Is it completely intractable?
7	Where does the notation $\pi_1(X,x)$ for the fundamental group first appear?
6	How “accidental” are equalities between parts of Ehrhart quasi-polynomials? When do they persist to Euler-Maclaurin?
5	Do fixed point sets in equivariant crepant resolutions have the same cohomology? How about for the specific case of Nakajima quiver varieties?

37 Tags

61 ag.algebraic-geometry × 12	8 integrable-systems
31 co.combinatorics × 8	6 pr.probability
24 gromov-witten-theory × 4	5 gerbes
21 mp.mathematical-physics × 3	5 examples
21 string-theory × 3	4 intuition

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3 Accounts

	MathOverflow	1,402 rep	712
	TeX - LaTeX	177 rep	6
	Academia	101 rep

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