maths-homotopy

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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

attached is my answer

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  idB . 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   Gn1  E  induced by the
homotopy pullback. Then we have the following map sequence

Gn  E   i  Gn1  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...

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