303 reputation
416
bio website
location Moscow, Russia
age
visits member for 4 years, 9 months
seen yesterday

On the Internet, nobody knows you're a dog.


Apr
18
comment A map inducing isomorphisms on homology but not on homotopy
(related question @ MSE: math.stackexchange.com/questions/750955)
Jan
11
comment Two kinds of orientability/orientation for a differentiable manifold
Related question on Math.SE
Dec
18
awarded  Commentator
Dec
18
comment sum of the character of the symmetric group
Related: roots of permutations
Nov
13
awarded  Excavator
Nov
13
revised Notions of convergence not corresponding to topologies
broken formatting (near "contains") fixed
Nov
13
suggested suggested edit on Notions of convergence not corresponding to topologies
Oct
7
awarded  Constituent
Oct
1
awarded  Caucus
Jun
30
awarded  Informed
Jun
30
comment From calculation of $H^\bullet(K(\pi;n))$ to explicit construction of operations
@Mariano Well, yes, this operation is $(a,2a,a)$ — so perhaps I should write $\langle 2a\rangle^3$ or $-\langle a\rangle^3$ (in 3-torsion $4=1$ and $8=-1$). Anyway, it's a Massey cube up to a sign.
Jun
30
asked From calculation of $H^\bullet(K(\pi;n))$ to explicit construction of operations
Jun
27
reviewed No Action Needed Magic trick based on deep mathematics
Jun
26
reviewed No Action Needed Coordinates on moduli spaces of curves
Jun
25
reviewed No Action Needed Best possible sieves for the jacobsthal problem, linear programming, and the prime 2
Jun
25
reviewed No Action Needed Are there examples of non-orientable manifolds in nature?
Jun
25
reviewed No Action Needed Uniquely generate all permutations of three digits that sum to a particular value?
Jun
25
reviewed No Action Needed Status of the Hadamard Circulant conjecture
Jun
25
reviewed No Action Needed What are some examples of interesting uses of the theory of combinatorial species?
Jun
25
reviewed No Action Needed Group rings of infinite products of groups