Mathematics / Math.GT

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An easily verifiable proof of the Brouwer fixed point theorem

An easily verifiable proof of the Brouwer fixed point theorem

: ๋ณธ ๋…ผ๋ฌธ์€ ๋ธŒ๋ฃจ์–ด ๊ณ ์ •์  ์ •๋ฆฌ๋ฅผ ๋‹ค๋ฃจ๋ฉฐ, ์ด ์ •๋ฆฌ๋Š” ์ˆ˜ํ•™์˜ ์—ฌ๋Ÿฌ ๋ถ„์•ผ์—์„œ ์ค‘์š”ํ•œ ์—ญํ• ์„ ํ•˜๋Š”๋ฐ๋„ ๋ถˆ๊ตฌํ•˜๊ณ  ๊ทธ ์ฆ๋ช…์ด ์ƒ๋Œ€์ ์œผ๋กœ ์–ด๋ ต๋‹ค๋Š” ์ ์— ์ฃผ๋ชฉํ•˜๊ณ  ์žˆ๋‹ค. ์ด๋Ÿฌํ•œ ๋ฐฐ๊ฒฝ ์•„๋ž˜ ๋ณธ ๋…ผ๋ฌธ์—์„œ๋Š” ๋ณต์žกํ•œ ์ฆ๋ช… ๋Œ€์‹  ๊ฐ„๋‹จํ•˜๋ฉด์„œ๋„ ๋ช…ํ™•ํ•œ ์ฆ๋ช… ๋ฐฉ๋ฒ•์„ ์ œ์‹œํ•œ๋‹ค. ๋…ผ๋ฌธ์˜ ํ•ต์‹ฌ์€ ๋ธŒ๋ฃจ์–ด ๊ณ ์ •์  ์ •๋ฆฌ์™€ Sperner ์ •๋ฆฌ ์‚ฌ์ด์˜ ๊ด€๊ณ„๋ฅผ ํƒ์ƒ‰ํ•˜๋Š” ๊ฒƒ์ด๋‹ค. Sperner ์ •๋ฆฌ๋Š” ๊ทธ๋ž˜ํ”ฝ์Šค๋‚˜ ๊ฒฝ์ œํ•™ ๋“ฑ ๋‹ค์–‘ํ•œ ๋ถ„์•ผ์—์„œ ํ™œ์šฉ๋˜๋ฉฐ, ์ด๋Š” ๋ธŒ๋ฃจ์–ด ๊ณ ์ •์  ์ •๋ฆฌ์™€ ์œ ์‚ฌํ•œ ์„ฑ์งˆ์„ ๊ฐ€์ง€๊ณ  ์žˆ๋‹ค. ๋ณธ ๋…ผ๋ฌธ์—์„œ๋Š” ์ด๋Ÿฌํ•œ ๋‘ ์ •๋ฆฌ ๊ฐ„์˜ ์—ฐ๊ฒฐ์„ฑ์„ ํ†ตํ•ด ์ƒˆ๋กœ์šด ์ฆ๋ช… ๋ฐฉ๋ฒ•์„

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