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Jul
11
comment Euler Class of a vector field
Just take the Euler class of the orthogonal $2$-plane field in $TM$, oriented with respect to $X$ by the right-hand rule. I think this question is more suitable for math.stackexchange.com.
May
11
awarded  Electorate
May
11
answered A question on existence of $Spin^c$-structure $P\to M$
May
8
comment How to prove this Weitzenbock formula?
Does this not follow from equation (4.14) on the previous page, which is Lemma 6.1.7 of Donaldson-Kronheimer?
Apr
1
answered Connection on canonical $\operatorname{Spin}^\mathbb{C}$ spinor bundle on symplectic manifold
Feb
24
answered Bakry-Emery Laplacian and Hodge Decomposition
Feb
13
awarded  Yearling
Jan
20
awarded  Enlightened
Jan
20
awarded  Nice Answer
Jan
20
awarded  Nice Answer
Jan
20
answered Construction of the Casson invariant
Jan
3
reviewed No Action Needed Getting the story of Dynkin and Satake diagrams straight
Nov
27
revised How many ways we have to prove that a topologically (or analytically) nice mapping is injective?
Fixed formatting
Nov
27
suggested approved edit on How many ways we have to prove that a topologically (or analytically) nice mapping is injective?
Nov
19
answered Uniqueness on square root of complex Line Bundle
Oct
25
comment Analytic stuctures on $\mathbb R^n$ and the nilpotent ideal of supermanifolds
Michael Freedman found the first exotic $\Bbb R^4$ in 1982. As far as I know Milnor never did any work on exotic $\Bbb R^4$'s.
Sep
30
awarded  Caucus
Sep
14
awarded  Deputy
Sep
11
reviewed Reviewed Can repunits be perfect cubes?
Sep
10
reviewed No Action Needed “Small” subfields of algebraically closed fields