Additions to the MAT 327 web site no longer count towards good deed points
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Week of...
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Notes and Links
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1
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Sep 13
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About This Class, Monday - Continuity and open sets, Thursday - topologies, continuity, bases.
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2
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Sep 20
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Monday - More on bases, Thursdsay - Products, Subspaces, Closed sets, HW1, HW1 Solutions
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3
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Sep 27
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Monday - the Cantor set, closures, Thursday, Class Photo, HW2, HW2 Solutions
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4
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Oct 4
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Monday - the axiom of choice and infinite product spaces, Thursday - the box and the product topologies, metric spaces, HW3, HW3 Solutions
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5
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Oct 11
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Monday is Thanksgiving. Thursday - metric spaces, sequencial closures, various products. Final exam's date announced on Friday.
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6
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Oct 18
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Monday - connectedness in , HW4, HW4 Solutions, Thursday - connectedness, path-connectedness and products
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7
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Oct 25
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Monday - Compactness of , Term Test on Thursday, TT Solutions
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8
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Nov 1
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Monday - compact is closed and bounded, maximal values, HW5, HW5 Solutions, Wednesday was the last date to drop this course, Thursday - compactness of products and in metric spaces, the FIP
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9
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Nov 8
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Monday-Tuesday is Fall Break, Thursday - Tychonoff and a taste of Stone-Cech, HW6, HW6 Solutions
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10
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Nov 15
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Monday - generalized limits, Thursday - Normal spaces and Urysohn's lemma, HW7, HW7 Solutions
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11
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Nov 22
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Monday - and , Thursday - Tietze's theorem
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12
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Nov 29
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Monday - compactness in metric spaces, HW8, HW8 Solutions, Thursday - completeness and compactness
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13
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Dec 6
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Monday - Baire spaces and no-where differentiable functions, Wednesday - Hilbert's 13th problem; also see December 2010 Schedule
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R
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Dec 13
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See December 2010 Schedule
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F
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Dec 20
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Final exam, Monday December 20, 2PM-5PM, at BR200
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Register of Good Deeds
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Add your name / see who's in!
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See Hilbert's 13th
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Reading
Read sections 37-38 in Munkres' textbook (Topology, 2nd edition). Remember that reading math isn't like reading a novel! If you read a novel and miss a few details most likely you'll still understand the novel. But if you miss a few details in a math text, often you'll miss everything that follows. So reading math takes reading and rereading and rerereading and a lot of thought about what you've read. Also, preread sections 30-33, just to get a feel for the future.
Doing
Solve and submit the following problems.
Problem 1. Problem 1 on page 235 of Munkres' book.
Problem 2. Show that is homeomorphic to the cantor set .
Problem 3. Show that any function from the integers into a "cube" has a unique continuous extension to .
Problem 4. Use the fact that there is a countable dense subset within to show that the cardinality of is greater than or equal to the cardinality of .
Problem 5. Show that the cardinality of is also less than or equal to the cardinality of , and therefore it is equal to the cardinality of .
Problem 6. Show that if and if is the corresponding generalized limit, and if is a bounded sequence and is a continuous function, then .
Problem 7. Show that there is no super-limit function defined on bounded sequences of reals with values in the reals which has the following 3 properties:
- .
- .
- , where is "shifted once": .
Due date
This assignment is due at the end of class on Thursday, November 18, 2010.
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Dror's notes above / Student's notes below
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Hi Dror, how do we prove some set has smaller cardinality to another set? I mean what do you mean by that?
Why in problem 5 it says that the cardinality of a set is less or equal to another set so that the cardinality are the same?
Xwbdsb 00:25, 13 November 2010 (EST)
Also I am wondering what is the super-limit because it wasn't done in class and it is not covered in the book too??Xwbdsb 00:36, 13 November 2010 (EST)
I remember that when proving the homeomorphism in question 2 there is another intricate argument for continuity that is
not the standard definition in our topology class? Sorry Dror I am sort of lost of what to do for this assignment...Xwbdsb 00:36, 13 November 2010 (EST)