Grigory M

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118 Answers

newest activity votes
3
Excision via simplicial sets
2
Ring structure on K-theory of an even-dimensioned sphere
3
Finite groups with periodic cohomology
3
How to understand the Todd class?
4
Ring structure of K-theory of a wedge of spheres
1
Minimal number of contractible sets covering $\mathbb{CP}^3$
1
equivalent definitions of orientation
1
What is the connection between Grothendieck's Differential Operators and Hochschild Cohomology
9
Maps between Eilenberg–MacLane spaces
18
Evaluate $ \binom{n}{0}+\binom{n}{2}+\binom{n}{4}+\cdots+\binom{n}{2k}+\cdots$
3
Why is this isomorphic to the reduced homology group?
0
What structure does the alternating group preserve?
4
Can Euler's identity be extended to quaternions?
6
About maps between homology groups
10
How useless can the Mayer-Vietoris sequence be in general?
6
How to compute homotopy classes of maps on the 2-torus?
1
How to compute homotopy classes of maps on the 2-torus?
13
What functor does $K(G, 1)$ represent for nonabelian $G$?
2
Classification of general fibre bundles
3
Why $PSL_3(\mathbb F_2)\cong PSL_2(\mathbb F_7)$?
2
Quaternionic veronese Embedding
3
Does a map of spaces inducing an isomorphism on homology induce an isomorphism between the homologies of the loop spaces?
1
$K(\mathbb R P^n)$ from $K(\mathbb C P^k)$
15
Why isn't $\mathbb{CP}^2$ a covering space for any other manifold?
8
A 1-1 function is called injective. What is an n-1 function called?
10
the number of loops on lattice?
8
Derivative of a product and derivative of quotient of functions theorem: I don't understand its proof
3
Is there something deep in the fact that an endomorphism of a finite dimensional complex vector space has an eigenvector?
14
Why can't I combine complex powers
4
Area of a triangle $\propto\pi-\alpha-\beta-\gamma$
1 2 3 4