New posts in Category Theory

Homomorphisms from $\prod_{i\in\mathbb Z}\mathbb Z $ to $\oplus_{i\in\mathbb Z}\mathbb Z$ that fixes $\oplus_{i\in\mathbb Z}\mathbb Z$

Functorial morphisms on the identity functor

Can monics always be "made left-invertible" by adding arrows?

What exactly is an arrow in a category?

Direct product of groups has inclusions, but it's still not the free product (coproduct)?

Various examples of non-representable functors

Category Theory: Does the existence of $X\times (Y\times Z)$ imply the existence of $X\times Y$?

Correct notion of "sameness" for objects in a category

Whiskering a natural isomorphism yields a natural isomorphism

Localization as dual to quotienting?