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seen Oct 27 '12 at 16:02

Oct
21
comment How does the reduced cone look like?
Yes, by rail I meant interval. I change the form of question, that's the question I got. We didn't mention topology.
Oct
21
revised How does the reduced cone look like?
Change the form of question
Oct
20
comment How does the reduced cone look like?
Thank you for your help, but I can't use it because I defined Cone(X) as union of all rails between points from X and one external point, the top of Cone.
Oct
20
asked How does the reduced cone look like?
Oct
17
comment How to prove that the slice category over a Quillen model category is also a Quillen model category?
I'm sorry because I'm not very clear in explaining,english is not my mother language, I'll try to do so now on. Yes,f is weak equivalence between A and B in the base C and slice category is $C/X$.
Oct
17
comment How to prove that the slice category over a Quillen model category is also a Quillen model category?
W.e. is diagram that comutes $h_1=h_2f$ and f is w.e. , $f:A->B, h_1:A->X, h_2:B->X$.Analog for fibration and cofibration
Oct
17
asked How to show that $\Delta[n]$ isn't Kan fibrant…?
Oct
17
revised How to prove that the slice category over a Quillen model category is also a Quillen model category?
edited title
Oct
17
comment Morphism is a retraction of another morphism?
I'm using slice category, I'm not sure how diagram looks like when f is retraction of g. Actually, I have to prove that slice category is Quillen model category by checking axioms and my stuck with retract axiom.
Oct
17
asked How to prove that coequalizer is a epimorphism?
Oct
17
asked Morphism is a retraction of another morphism?
Oct
16
asked How to prove that the slice category over a Quillen model category is also a Quillen model category?
Oct
12
awarded  Student
Oct
12
awarded  Editor
Oct
12
revised How to show that wedge sum is coproduct?
added 1 characters in body
Oct
12
asked How to show that wedge sum is coproduct?