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The Four Color Theorem & Counterexample

The Four Color Theorem & Counterexample. Ps: of course all the counterexamples are wrong by now. made by 赵新榆. 161120181. PART 01. PART 02. PART 03. PART 04. Martin Gardner and his shenanigan. Covering it with 4 colors. Extention1: Adding the surrounding. Extention2:

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The Four Color Theorem & Counterexample

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  1. The Four Color Theorem & Counterexample Ps: of course all the counterexamples are wrong by now. made by 赵新榆 161120181

  2. PART 01 PART 02 PART 03 PART 04 Martin Gardner and his shenanigan Covering it with 4 colors Extention1: Adding the surrounding Extention2: N colors theorem

  3. PART 01 Martin Gardner and his shenanigan Who is Martin Gardner? When and why did he put forward it? Did he really come up with a counterexample?

  4. Background: Introduction to Martin Gardner Martin Gardner: ·An American popular mathematics and popular sciencewriter ·Interests: scientific skepticism, micromagic, philosophy, religion, and literature—especially the writings of Lewis Carroll · The long-time “Mathematical Games” columnist in Scientific American

  5. Martin Gardner's April Fool's Map Time: April Fools’ Day in 1975 It was punished in the magazine Scientific American

  6. PART 02 Solutions with 4 colors Is there any tips to solve it quickly and accuratedly?

  7. Covering it with 4 colors Here we start Tips: Start from outside or inside? 2.How is the routine? 3.Which to choose when there are two or more choices?

  8. Covering it with 4 colors

  9. Covering it with 4 colors Q: How many solutions are there in total? I never dreamed anyone would take it seriously, yet it produced more than a thousand letters from readers who did not recognize the column as a hoax.

  10. PART 03 Extention1: Adding the surrounding Will it be more difficult?

  11. Covering it with 4 colors

  12. PART 04 Extention2: N colors theorem What will it be like in three dimensions?

  13. N Colors Theorem in Three Dimensions 1.In reality No limit Equivalent to that on the plane 2. On the sphere or cylinder 7 colors 3.On the torus 4.Generalizations g= genus

  14. Reference https://en.wikipedia.org/wiki/Four_color_theorem 2. https://blogs.scientificamerican.com/observations/unscientific-unamerican-and-other-april-fools-jokes-in-sa-history/ 3. http://mathforum.org/wagon/fall97/p840.html 4. https://mathnexus.wwu.edu/archive/news/detail.asp?ID=19 5.https://baike.baidu.com/item/%E9%A9%AC%E4%B8%81%C2%B7%E5%8A%A0%E5%BE%B7%E7%BA%B3/1501206?fr=aladdin

  15. Thank You All!

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