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I NEED THE FOLLOWING QUESTIONS SOLVED IN A PERFECT MANNER ,PLEASE ONLY SAY YES IF YOU CAN DO THEM PERFECT . I AM ATTACHING THE BOOK PIC AS WELL SO IF YOU NEED HELP YOU MIGHT SEARCH IT. I NEED 18.3 , 18.5 , 18.6 , 18.8 , 18.10 , 18.12, 18.19 , 18.45.
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Explanation & Answer
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Question 18.3:
(a) The space in the top face of the curve is given by F * F , and the map in the top face of the
curve is given by F * F Q
D .
(b) Suppose that the strictly commutative square
A
C
D
B
is a strong homotopy pullback square. Thus, there exists a canonical map: : Q D from the
homotopy pushout of Q as well as : A P to the homotopy pullback P of C D B .
The square is strong homotopy pullback iff is a homotopy equivalence. Hence, it must follow
that fits into the fiber sequence F * F Q
D and hence theorem 18.1 is proved.
(c)Suppose that B D is a (b-1)-equivalence and C D is a (c-1)-equivalence. Hence, it
follows that : Q D is a (b+c-1)-equivalence as a result of F * F Q
D being fitted
by .
Question 18.5:
(a) Let f : F B E be any given map with secat E n and any homotopy section
: E F of in0 : F * . Consider the given homotopy pullback, where n , id F B is
the whisker map induced by the homotopy pullback F B . By the ‘Prism lemma’, we know
that the homotopy pullback of a and pr1 is F B , and that pr2 a idB . Hence, it follows
that the diagram commutes up to homotopy, as desired.
(b) Notice that pr1
e since pr1
pr2 pr1
pr2 a e e . Hence, the homotopy fiber of
g : G E B is F * B .
Question 18.6:
(a) For i 0 , there is a whisker map i idGn , i : Gn E Gn1 E induced by the
homotopy pullback. Then we have the following map sequence
Gn E i Gn1 E i Gn E and i is a homotopy section of i . Moreover,
i i
i 1 , hence also i 1 i i 1 ... 0 .
Hence, it follows that the iterated Ganea construction gives...