0708-1300/Homework Assignment 12

0708-1300/Navigation Panel   Add your name / see who's in! # Week of... Links Fall Semester 1 Sep 10 About, Tue, Thu 2 Sep 17 Tue, HW1, Thu 3 Sep 24 Tue, Photo, Thu 4 Oct 1 Questionnaire, Tue, HW2, Thu 5 Oct 8 Thanksgiving, Tue, Thu 6 Oct 15 Tue, HW3, Thu 7 Oct 22 Tue, Thu 8 Oct 29 Tue, HW4, Thu, Hilbert sphere 9 Nov 5 Tue,Thu, TE1 10 Nov 12 Tue, Thu 11 Nov 19 Tue, Thu, HW5 12 Nov 26 Tue, Thu 13 Dec 3 Tue, Thu, HW6 Spring Semester 14 Jan 7 Tue, Thu, HW7 15 Jan 14 Tue, Thu 16 Jan 21 Tue, Thu, HW8 17 Jan 28 Tue, Thu 18 Feb 4 Tue 19 Feb 11 TE2, Tue, HW9, Thu, Feb 17: last chance to drop class R Feb 18 Reading week 20 Feb 25 Tue, Thu, HW10 21 Mar 3 Tue, Thu 22 Mar 10 Tue, Thu, HW11 23 Mar 17 Tue, Thu 24 Mar 24 Tue, HW12, Thu 25 Mar 31 Referendum,Tue, Thu 26 Apr 7 Tue, Thu R Apr 14 Office hours R Apr 21 Office hours F Apr 28 Office hours, Final (Fri, May 2) Register of Good Deeds Errata to Bredon's Book

Announcements go here

Reading

Read, reread and rereread your notes to this point, and make sure that you really, really really, really really really understand everything in them. Do the same every week!

Also, read section 8-11, 13 and 18-20 of chapter IV of Bredon's book three times:

• First time as if you were reading a novel - quickly and without too much attention to detail, just to learn what the main keywords and concepts and goals are.
• Second time like you were studying for an exam on the subject - slowly and not skipping anything, verifying every little detail.
• And then a third time, again at a quicker pace, to remind yourself of the bigger picture all those little details are there to paint.

Doing

Solve all the problems in pages 206-207 of Bredon's book, but submit only your solutions of problems 1, 5, 9, and all the problems in pages 230 but submit only problem 1.

Also, solve and submit the following:

Problem. Given a CW-space $K$ with $n$-cells indexed by $K_{n}$ and skeleta denoted $K^{n}$, show that the map $\partial _{1}:\langle K_{n}\rangle \to \langle K_{n-1}\rangle$ given by the composition $H_{n}(K^{n},K^{n-1})\longrightarrow H_{n-1}(K^{n-1})\longrightarrow H_{n-1}(K^{n-1},K^{n-2})$ is equal to the one defined using degrees: $\partial _{2}\sigma =\sum _{\tau \in K_{n-1}}[\tau :\sigma ]\tau$, where $[\tau :\sigma ]:=\deg p_{\tau }\circ f_{\partial \sigma }$ and the $f_{\partial \sigma }$'s are the gluing maps defining $K$.

Hint. Dror's notes on the subject are:

Divide and conquer!

Due Date

This assignment is due in class on Thursday April 10, 2008.