Math 21-350 Calendar

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Math 21-350 Spring 2017
Combinatorial Coloring
Course Calendar

Updated 13 February 2017

This calendar is subject to revision throughout the term.

Wednesday, 15 February: Introductions, gumdrops.
Friday, 17 February: No class

Monday, 20 February: The road to Hadwiger-Nelson: 4-color theorem. Genesis, Kempe's 'proof'
Wednesday, 22 February: Kempe's 'proof' continued, Tait's attempts
Friday, 24 February: 'Proof' by technology: Appel and Haken, and controversy.

Monday, 27 February: Appel and Haken, continued. Robertson and Seymour come on the scene.
Wednesday, 1 March Related map coloring problems, Victorian to present day.
Friday, 3 March: The 'Second 4-color problem': Hadwiger-Nelson. Genesis. Map-coloring approach.

Monday, 6 March: Map-coloring approach, continued. Townsend-Woodall.
Wednesday, 8 March: Townsend-Woodall, continued.
Friday, 10 March: No class

Monday, 13 March: No class
Wednesday, 15 March: No class
Friday, 17 March: No class

Monday, 20 March: Infinity by way of finiteness: De Bruijn-Erdos.
Wednesday, 22 March: De Bruijn-Erdos, continued
Friday, 24 March: Finding finite graphs: some cool pictures.

Monday, 27 March: On to something completely different: Ramsey Theory!
Wednesday, 29 March: The Happy End problem, a love story.
Friday, 31 March: Coloring integers: How Ramsey didn't really start Ramsey Theory. Schur's Theorem, Van der Waerden.

Monday, 3 April: Schur and Van der Waerden, continued.
Wednesday, 5 April: The life and times of Van der Waerden.
Friday, 7 April: Who cares about colored integers? The road to Green-Tao, by way of Szemeredi.

Monday, 10 April: Green-Tao, continued.
Wednesday, 12 April: Coloring polygons: Ramsey meets maps.
Friday, 14 April: Gallai's Theorem

Monday, 17 April: Gallai, continued.
Wednesday, 19 April: catch up
Friday, 21 April: No class

Monday, 24 April:
Wednesday, 26 April:
Friday, 28 April:

Monday, 1 May:
Wednesday, 3 May:
Friday, 5 May:

Final Essay/project due on Friday, 12 May 2017.