Paul Johnson's user avatar
Paul Johnson's user avatar
Paul Johnson's user avatar
Paul Johnson
  • Member for 14 years, 5 months
  • Last seen more than 1 year ago
30 votes
3 answers
3k views

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?

18 votes
1 answer
1k views

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?

8 votes
1 answer
1k views

Where does the notation $\pi_1(X,x)$ for the fundamental group first appear?

7 votes
1 answer
259 views

How "accidental" are equalities between parts of Ehrhart quasi-polynomials? When do they persist to Euler-Maclaurin?

6 votes
2 answers
890 views

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

3 votes
0 answers
62 views

Functions specializing to theta functions of lattices of different dimensions and to a rational function

3 votes
1 answer
283 views

Is anything written about winning the "Dollar Game" in the minimal number of moves?