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visits member for 1 year, 9 months
seen May 29 '13 at 19:08

Some madnesses kill. Apparently not many.


May
29
asked Subobjects and quotient objects in category of topological spaces
May
5
asked How to pose a decent counting problem of cells in higher category?
May
2
accepted Thin categories: up to isomorphism Vs up to equivalance
May
2
comment Thin categories: up to isomorphism Vs up to equivalance
A poset is a preorderd set which satisfy the anti-symmetry axiom; x<y and y<x => x=y
May
2
comment Thin categories: up to isomorphism Vs up to equivalance
I know the deference of isomorphic of categories and equivalent categories {in equivalence we don't necessarily get back to the very same object but an object isomorphic to that}. But why this terminology is used here. Why thin category differs with a partially ordered class?
May
2
asked Thin categories: up to isomorphism Vs up to equivalance
Feb
1
accepted The relation between retraction and coproduct in R-Mod
Jan
30
asked The relation between retraction and coproduct in R-Mod
Jan
26
comment Functor between categories with weak equivalance.
Totally agree. This one sounds more instructive.
Jan
26
comment Functor between categories with weak equivalance.
Thank you.. I need to think to localization more. I see what universal property is satisfied by localization, but the proof, i.e. the construction of the localized category is yet artificial in my eyes.
Jan
26
accepted Functor between categories with weak equivalance.
Jan
26
asked Functor between categories with weak equivalance.
Oct
13
asked Why determinant is a natural transformation?
Oct
10
asked How to prove distributivity in Boolean Rings
Sep
23
asked How to reconstruct a connected Lie group, from a given lattice in it?
Jul
18
comment A question about the definition of species.
Maybe I am comfused about the defenition of an endofunctor. Is it F:G-->G necessarily defined for all of the objects in G?
Jul
18
asked A question about the definition of species.
Jul
16
awarded  Scholar
Jul
16
accepted What is a separator object?
Jul
16
awarded  Supporter