Mathematics / Math.AP

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Injectivity and flatness of semitopological modules

Injectivity and flatness of semitopological modules

๋ณธ ๋…ผ๋ฌธ์€ ๋ณต์žกํ•œ ์ˆ˜ํ•™์  ๊ฐœ๋…์ธ ์ฃผ์ž…์„ฑ(injectivity)๊ณผ ํ‰๋ฉด์„ฑ(flatness) ์‚ฌ์ด์˜ ๊ด€๊ณ„๋ฅผ ํƒ๊ตฌํ•œ๋‹ค. ์ด๋Ÿฌํ•œ ์„ฑ์งˆ๋“ค์€ ๋Œ€์ˆ˜์  ๊ตฌ์กฐ, ํŠนํžˆ ๋ชจ๋“ˆ์—์„œ ์ค‘์š”ํ•œ ์—ญํ• ์„ ํ•˜๋Š”๋ฐ, ์ด๋Š” ํ•จ์ˆ˜ ๊ณต๊ฐ„์ด๋‚˜ ๋ถ„ํฌ ๊ณต๊ฐ„ ๋“ฑ ๋‹ค์–‘ํ•œ ์ˆ˜ํ•™์  ๊ฐ์ฒด์— ์ ์šฉ๋  ์ˆ˜ ์žˆ๋‹ค. ์ฃผ์ž…์„ฑ๊ณผ ํ‰๋ฉด์„ฑ์˜ ๊ธฐ๋ณธ ๊ฐœ๋… ์ฃผ์ž…์„ฑ์€ ๋ชจ๋“ˆ์ด ์–ด๋–ค ํŠน์ •ํ•œ ์กฐ๊ฑด ํ•˜์—์„œ '์ฃผ์ž…'๋˜๋Š” ์„ฑ์งˆ์„ ์˜๋ฏธํ•œ๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด, A ๋ชจ๋“ˆ E'๊ฐ€ ฯƒ(E', E)์— ๋Œ€ํ•œ ๋ฐ˜ํ† ํด๋กœ์ง€์ ์ด๋ผ๋ฉด, k ๋ฒกํ„ฐ ๊ณต๊ฐ„ E๋Š” A์— ๋Œ€ํ•œ ์šฐ์ธก ๋ชจ๋“ˆ์ด ๋œ๋‹ค. ์ด ๊ฒฝ์šฐ, ์ฃผ์ž…์„ฑ์€ ๋ชจ๋“ˆ ์‚ฌ์ด์˜ ๋งคํ•‘์ด ์ผ๋Œ€์ผ(one to

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