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5 votes
1 answer
306 views

Computing Pontryagin Square

4 votes
1 answer
574 views

Symmetric tensor of Lie algebra of $su(N)$

4 votes
1 answer
266 views

Parameterization Of Grassmannian

4 votes
0 answers
56 views

Pontryagin Square of 1st Stiefel Whitney Class

3 votes
1 answer
290 views

Criteria of a real vector bundle to be Stably trivial

3 votes
0 answers
54 views

Wu formula for $\mathbb{Z}_N$ classes

3 votes
1 answer
166 views

Symmetric tensor of Lie algebra of $su(N)$

3 votes
0 answers
151 views

"winding number" of the map: $M \to S^3$ when $M$ is a non-orientable 3-manifold

3 votes
1 answer
209 views

Second homotopy class of complex Grassmannian

3 votes
0 answers
102 views

Stiefel-Whitney class of $O(2)$ and $SO(2)$

2 votes
0 answers
45 views

Decompose a two-manifold into the union of Orientation Reversal Pairs

1 vote
0 answers
76 views

Fierz like identity for $\epsilon_{abc}\sigma^a_{ij}\sigma^b_{kl}\sigma^c_{pq}$

1 vote
0 answers
70 views

Chern Class and Stiefel-Whitney class for $U(N)$ and $PSU(N)$ vector bundle

1 vote
1 answer
397 views

lower bound for vector inner products

1 vote
0 answers
45 views

Condition for quadratic form/refinement to exist

0 votes
0 answers
49 views

faithful representation of a group and its subgroup

0 votes
1 answer
85 views

Dirac delta function as a derivative of some function

0 votes
0 answers
35 views

Solution of $\vec x^2=1, \vec y^2=1, \vec x\cdot \vec y=-1/2$

0 votes
1 answer
523 views

Eigenvalue and eigenvectors of a matrix and its Hermitian conjugate

0 votes
1 answer
31 views

Find the analytic expression of the Limit of a Sequence with the recurrence relation $a_n= \frac{1}{P-a_{n-1}}$

0 votes
0 answers
13 views

The value of $H^2(U(N), U(1))$

0 votes
1 answer
73 views

Generating function of number of assignments with constraints