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Sep
8
answered History of category theory
May
30
asked Is $\Omega \tilde X \simeq \Omega_0 X$?
May
16
asked On pushouts and mapping cylinders in exact categories
May
3
answered In a Morita context ($A, B, P, Q, f, g$), why are $P$ and $Q$ projective if $f$ is surjective?
Apr
23
answered What is the suspension used in the Freudenthal suspension theorem?
Apr
20
answered Equivalence of definitions for “normal extension” and how to lift isomorphisms to them
Apr
15
answered When are generalized Severi-Brauer varieties trivial?
Apr
5
answered If a morphism of pushouts of complexes (with one arrow monic) is composed of quasi-isos, then the induced arrow is one also
Mar
21
answered Is complex exact if its Euler characteristic is zero?
Mar
19
answered Size Issues in Category Theory
Mar
18
answered Application of Composition of Functions: Real world examples?
Mar
18
answered Categorical introduction to Algebra and Topology
Mar
18
answered Why is $\pi_1(\Bbb{R}^n,x_0)$ the trivial group in $\Bbb{R}^n$?
Mar
15
answered How to prove a Set category with at least one element is a separator?
Mar
14
asked If a morphism of pushouts of complexes (with one arrow monic) is composed of quasi-isos, then the induced arrow is one also
Feb
7
asked The groups $[\Sigma^nX,Y]$ versus the homotopy groups
Jan
31
asked Homology with local coefficients in a $\mathbb{Z}[\pi_1(X)]$-module
Dec
26
asked When are generalized Severi-Brauer varieties trivial?
Nov
26
asked Is an integer a sum of two rational squares iff it is a sum of two integer squares?
Nov
26
answered Every 4-dimensional isotropic quadratic space of determinant 1 is hyperbolic