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Apr
7
answered If an identity in the language of rings holds for all fields, does it necessarily hold for all commutative rings?
Apr
7
answered Why is this function not injective?
Apr
7
answered CABool not cartesian closed
Apr
7
answered Reason behind standard names of coefficients in long Weierstrass equation
Apr
7
answered Let $f : C \rightarrow D$ denote an arrow of a 2-category. Does “cone to $f$” have a commonly accepted meaning?
Apr
6
answered An elementary question about $\pi_0$ and two homotopic maps
Apr
2
answered Morphism between two $K$-schemes restricted to an affine subscheme
Apr
1
answered Peculiar examples to the Stone Representation Theorem
Mar
31
asked A theorem of Kan regarding fibrant replacement
Mar
30
answered Precomposition with a faithful functor
Mar
28
answered Constructing a ring in Top by wedging and smashing pointed spaces
Mar
27
answered Equality of rank for homology and cohomology groups via the universal coefficient theorem
Mar
26
answered Sets is not Equivalent to $sets^{op}$
Mar
25
answered Topological dimension and derham cohomological dimension
Mar
24
answered Zero direct limit of nonzero objects
Mar
24
answered Can a quasi-identity express that a function $f$ is surjective? And if not, can this be explained by duality?
Mar
23
answered Is there a way to phrase “there does not exist a universal set” in structural language?
Mar
22
answered Cohomological Whitehead theorem
Mar
22
answered Are presheaf categories well-copowered?
Mar
22
answered Is there a first order theory for equivalences classes?