0708-1300/Term Exam 1

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

Term Exam 1 took place on Thursday November 8, 2007, at 6PM, at Sydney Smith 1084.

Dror's Internal Notes

Dror's notes above / Student's notes below

Some Additional Reading

There are some lectures notes of the MIT Open Course Ware. This can be an additional reading for us. There are some exercises too.

More lectures notes from the University of Dublin. This one has exercises.

From Wien with exercises too.

The Exam

Front

Do not turn this page until instructed.

Math 1300 Geometry and Topology

Term Test

University of Toronto, November 8, 2007

Solve the 4 problems on the other side of this page.

Each problem is worth 30 points.

You have two hours to write this test.

Notes.

• No outside material other than stationary is allowed.
• Neatness counts! Language counts! The ideal written solution to a problem looks like a page from a textbook; neat and clean and made of complete and grammatical sentences. Definitely phrases like "there exists" or "for every" cannot be skipped. Lectures are mostly made of spoken words, and so the blackboard part of proofs given during lectures often omits or shortens key phrases. The ideal written solution to a problem does not do that.

Good Luck!

Back

Solve the following 4 problems. Each problem is worth 30 points. You have two hours. Neatness counts! Language counts!

Problem 1 "Compute". Let $\phi :{\mathbb {R} }_{x,y}^{2}\to {\mathbb {R} }_{u,v}^{2}$ be given by $u(x,y)=x^{2}-y^{2}$ and $v(x,y)=2xy$, let $f:{\mathbb {R} }_{u,v}^{2}\to {\mathbb {R} }$ be given by $f(u,v)=u^{2}+v^{2}$, and let $\xi \in T_{(0,1)}{\mathbb {R} }_{x,y}^{2}$ be $\xi =\partial /\partial x$. Compute the following quantities (with at least some justification):

1. $\phi _{\star }\xi$.
2. $\phi ^{\star }f$.
3. $(\phi _{\star }\xi )f$.
4. $\xi (\phi ^{\star }f)$.

Problem 2 "Reproduce". The tangent space $T_{0}{\mathbb {R} }^{n}$ to ${\mathbb {R} }^{n}$ at $0$ can be defined in the following two ways:

1. $T_{0}^{1}{\mathbb {R} }^{n}$ is the set of all smooth curves $\gamma :{\mathbb {R} }\to {\mathbb {R} }^{n}$ satisfying $\gamma (0)=0$, modulo the equivalence relation $\sim$, where $\gamma _{1}\sim \gamma _{2}$ iff ${\dot {\gamma }}_{1}(0)={\dot {\gamma }}_{2}(0)$, where in general, ${\dot {\gamma }}$ denotes the derivative of $\gamma (t)$ with respect to $t$.
2. $T_{0}^{2}{\mathbb {R} }^{n}$ is the set of all linear functionals $D$ on the vector space of smooth functions on ${\mathbb {R} }^{n}$, which also satisfy Leibnitz' rule, $D(fg)=(Df)g(0)+f(0)(Dg)$.

Prove that these two definitions are equivalent (i.e., that there is a natural bijection between $T_{0}^{1}{\mathbb {R} }^{n}$ and $T_{0}^{2}{\mathbb {R} }^{n})$. If you use a non-trivial lemma from calculus, state it precisely but you don't need to prove it.

Problem 3 "Think". Let $f:M\to M$ be a smooth function from a compact manifold $M$ to itself. Prove that there is a point $y\in M$ so that $f^{-1}(y)$ is finite. (In fact, there are many such points).

Problem 4 "Sketch". Sketch to the best of your understanding the proof of the Whitney embedding theorem, paying close attention to what is important and little attention to what is not. Here, more than anywhere else, neatness and language count!

Good Luck!

The Results

32 students took this test. The average grade was 82.6 and the standard deviation 24.6. All grades are on CCNet.