Mathematics / Math.FA

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Convex hyperspaces of probability measures and extensors in the   asymptotic category

Convex hyperspaces of probability measures and extensors in the asymptotic category

๋งค๋ ฅ์ ์ธ ํ•œ๊ธ€ ์ œ๋ชฉ: ํ™•๋ฅ  ์ธก๋„ ๊ณต๊ฐ„์—์„œ ์••์ถ• ๊ณต์ง‘์˜ ์ ˆ๋Œ€ ํ™•์žฅ์„ฑ ์—ฐ๊ตฌ ์ดˆ๋ก ์ „์ฒด ๋ฒˆ์—ญ ๋ฐ ์ •๋ฆฌ: ๋ณธ ๋…ผ๋ฌธ์€ ๋ฉ”ํŠธ๋ฆญ ๊ณต๊ฐ„ ์œ„์— ์ •์˜๋œ ํ™•๋ฅ  ์ธก๋„ ๊ณต๊ฐ„๊ณผ ๊ทธ ํ•˜์ดํผ์ŠคํŽ˜์ด์Šค์ธ ์••์ถ• ๊ณต์ง‘์˜ ์ ˆ๋Œ€ ํ™•์žฅ์ž ์„ฑ์งˆ์„ ํƒ๊ตฌํ•œ๋‹ค. ํŠนํžˆ, ๊ทผ์‚ฌ ๋ฒ”์ฃผ์—์„œ ์ด๋Ÿฌํ•œ ๊ณต๊ฐ„๋“ค์ด ์ ˆ๋Œ€ ํ™•์žฅ์ž๊ฐ€ ๋˜๋Š”์ง€ ์—ฌ๋ถ€๋ฅผ ๋ถ„์„ํ•œ๋‹ค. ๋…ผ๋ฌธ์€ ๋“œ๋ผ๋‹ˆ์‹œ๋‹ˆ์ฝ”ํ”„๊ฐ€ ์ œ๊ธฐํ•œ ๋ฌธ์ œ์— ๋Œ€ํ•œ ๋ถ€์ •์ ์ธ ๋‹ต๋ณ€์„ ์ œ๊ณตํ•˜๋ฉฐ, ์ด๋Š” ๋ฉ”ํŠธ๋ฆญ ๊ณต๊ฐ„์˜ ํ™•๋ฅ  ์ธก๋„ ๊ณต๊ฐ„์ด ์ผ๋ฐ˜์ ์œผ๋กœ ๊ทผ์‚ฌ ๋ฒ”์ฃผ์˜ ์ ˆ๋Œ€ ํ™•์žฅ์ž๊ฐ€ ์•„๋‹ˆ๋ผ๋Š” ๊ฒƒ์„ ๋ณด์—ฌ์ค€๋‹ค. ๋˜ํ•œ, ๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” ์••์ถ• ๊ณต์ง‘์˜ ํŠน์„ฑ์„ ๋ถ„์„ํ•˜๊ณ , ์ด๋ฅผ ํ†ตํ•ด ํ™•๋ฅ  ์ธก๋„ ๊ณต

Mathematics
Preservation of the Borel class under open-$LC$ functions

Preservation of the Borel class under open-$LC$ functions

๋ณธ ๋…ผ๋ฌธ์€ ๋ณด๋  ์ง‘ํ•ฉ๊ณผ ๊ทธ ๋ณด๋  ํด๋ž˜์Šค์— ๋Œ€ํ•œ ์ค‘์š”ํ•œ ์ด๋ก ์  ๊ฒฐ๊ณผ๋ฅผ ์ œ๊ณตํ•œ๋‹ค. ํŠนํžˆ, ๊ฐœ๋ฐฉํ˜• ํด๋กœ์ฆˆ๋“œ(clopen) ํ•จ์ˆ˜๋ผ๋Š” ์ƒˆ๋กœ์šด ๊ฐœ๋…์„ ๋„์ž…ํ•˜์—ฌ, ์ด๋Ÿฌํ•œ ํ•จ์ˆ˜๊ฐ€ ํŠน์ • ์กฐ๊ฑด ํ•˜์—์„œ ๋ณด๋  ์ง‘ํ•ฉ์˜ ๋ณด๋  ํด๋ž˜์Šค๋ฅผ ์œ ์ง€ํ•˜๋Š” ๊ฒƒ์„ ์ฆ๋ช…ํ•˜๊ณ  ์žˆ๋‹ค. 1. ์„œ๋ก  ์„œ๋ก ์—์„œ๋Š” ๋ณด๋  ์ง‘ํ•ฉ๊ณผ ๊ทธ ๋ณด๋  ํด๋ž˜์Šค์— ๋Œ€ํ•œ ๊ธฐ์กด ์—ฐ๊ตฌ๋ฅผ ๊ฐ„๋žตํžˆ ์†Œ๊ฐœํ•œ๋‹ค. ํŠนํžˆ, ๋ณด๋  ์ง‘ํ•ฉ C์˜ ๋ถ€๋ถ„ ์ง‘ํ•ฉ X์™€ ์—ฐ์† ํ•จ์ˆ˜ f: X โ†’ Y๊ฐ€ ์ฃผ์–ด์กŒ์„ ๋•Œ, ๋งŒ์•ฝ ๋ชจ๋“  ํด๋กญ์—” ์„ธํŠธ U์˜ ์ด๋ฏธ์ง€ f(U)๊ฐ€ ์—ด๋ฆฐ ์ง‘ํ•ฉ์ด๊ฑฐ๋‚˜ ๋‹ซํžŒ ์ง‘ํ•ฉ์ด๋ผ๋ฉด, Y๋Š” ๋™์ผํ•œ ๋ณด๋  ํด๋ž˜์Šค๋ฅผ ๊ฐ€์ง„๋‹ค๋Š” ๊ฒฐ๊ณผ๋ฅผ ์–ธ๊ธ‰

Mathematics

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