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Nov
26
answered The empty set in homotopy theoretic terms (as a simplicial set/top. space)
Nov
26
answered Kan fibrations and surjectivity
Nov
24
answered Can every proof by contradiction also be shown without contradiction?
Nov
20
answered What does the maximal basis for a Grothendieck topology look like?
Nov
20
answered Does the functor of points commutes with inverse limits?
Nov
20
answered $F(M)$ as a $\text{Hom}_{R_1}(M,M)$-module for some functor $F:R_1-\text{mod}\rightarrow R_2-\text{mod}$
Nov
17
answered Does the Yoneda extension of a functor preserving monomorphisms also preserve monomorphisms?
Nov
12
answered Inhabited versus nonempty sets - disasters without excluded middle?
Nov
6
answered Does the forgetful functor from $T/C$ to $C$ preserve non-trivial colimits?
Nov
5
answered Category whose objects and morphisms are the same structures
Nov
5
answered Extending a Set of Linearly Independent Vector Fields to a Basis
Nov
4
answered Injective Cogenerators in the Category of Modules over a Noetherian Ring
Nov
4
answered Non-closed compact subspace of a non-hausdorff space
Nov
3
answered Does a natural transformation on sites induce a natural transformation on presheaves?
Nov
3
answered Cogroup objects in topological spaces
Oct
29
asked Prime ideals of height less than the dimension
Oct
25
answered Example of a functor from the slice topos into the whole topos which does not preserve monomorphisms
Oct
20
answered How can function fields have different degrees over the projective line
Oct
17
answered How to show that $\Delta[n]$ isn't Kan fibrant…?
Oct
17
asked What is a copresheaf on a “precategory”?