Paul Johnson

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Name	Paul Johnson
Member for	3 years
Seen	Apr 26 at 19:42
Website	www2.imperial.ac.uk/~pjohnso1
Location	London
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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?

co.combinatorics hyperplane-arrangements ag.algebraic-geometry

apr 23 11 at 21:43 Paul Johnson 1,211●5●7

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Do fixed point sets in equivariant crepant resolutions have the same cohomology? How about for the specific case of Nakajima quiver varieties?

ag.algebraic-geometry rt.representation-theory resolution-of-singulariti quivers equivariant

jun 15 at 21:17 Hiraku Nakajima 1,133●5●10

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Products of Conjugacy Classes in S_n

how does one understand GRR? (Grothendieck Riemann Roch)

Virasoro constraints for the generating function of Hurwitz numbers.

Gromov-Witten and integrability.

Examples of “folk theorems”

a question about Gromov-Witten invariant

Shuffling decks of cards where not all cards are distinguishable

Gerbes for a cyclic group. (or maybe G_m too)

Gromov-Witten and integrability 2.

Known Mirror Calabi-Yau pairs

orbifold covering

number of weighted trivalent trees

Intuition behind the age grading in quantum cohomology of orbifolds

What’s so great about blackboards?

Line bundles on moduli spaces

How to recover partition from its multiset of hook lengths?

Finding the vertices of a polyhedral complex coming from a GIT wall and chamber decomposition

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