Mathematics / Math.CT

All posts under category "Mathematics / Math.CT"

6 posts total
Sorted by date
No-go theorems for functorial localic spectra of noncommutative rings

No-go theorems for functorial localic spectra of noncommutative rings

๋ณธ ๋…ผ๋ฌธ์€ ๋น„์ปค๋ฎค๋‹ˆํ‹ฐ๋ธŒ C ๋Œ€์ˆ˜์— ๋Œ€ํ•œ ๊ฒ”ํŒ๋“œ ์ŠคํŽ™ํŠธ๋Ÿผ์˜ ์ผ๋ฐ˜ํ™”๋ฅผ ์‹œ๋„ํ•˜๋Š” ๋ฐ ์žˆ์–ด ์ค‘์š”ํ•œ ์ œํ•œ์  ๊ฒฐ๊ณผ๋ฅผ ์ œ๊ณตํ•œ๋‹ค. ์ด ์—ฐ๊ตฌ๋Š” ํŠนํžˆ ํ–‰๋ ฌ ๋Œ€์ˆ˜ M n(C) (n โ‰ฅ 3)์—์„œ ์ž๋ช…ํ•œ ๋กœ์ปฌ์„ ์ƒ์„ฑํ•œ๋‹ค๋Š” ์ ์—์„œ, ์ „ํ†ต์ ์ธ ํ† ํฌ์Šค ๊ฐœ๋…์ด ๋น„์ปค๋ฎค๋‹ˆํ‹ฐ๋ธŒ C ๋Œ€์ˆ˜์— ๋Œ€ํ•œ ์ข‹์€ ์ŠคํŽ™ํŠธ๋Ÿผ ๊ฐœ๋…์„ ํฌ์šฉํ•˜๋Š” ๋ฐ ๋ถ€์ ์ ˆํ•จ์„ ๊ฐ•๋ ฅํ•˜๊ฒŒ ๋ณด์—ฌ์ค€๋‹ค. 1. ๋ ˆ์˜ˆ์Šค ์ •๋ฆฌ์˜ ํ™•์žฅ ๋ ˆ์˜ˆ์Šค์˜ ๋…ผ๋ฌธ์€ ๋ชจ๋“  ์ปค๋ฎคํ‹ฐ๋ธŒ C ๋Œ€์ˆ˜์— ๋Œ€ํ•ด ๊ฒ”ํŒ๋“œ ์ŠคํŽ™ํŠธ๋Ÿผ์„ ํ• ๋‹นํ•˜๋Š” ํŽ‘ํ„ฐ๊ฐ€ ํ–‰๋ ฌ ๋Œ€์ˆ˜ M n(C) (n โ‰ฅ 3)์—์„œ ์ž๋ช…ํ•œ ๊ฒฐ๊ณผ๋ฅผ ์–ป๋Š”๋‹ค๋Š” ๊ฒƒ์„ ๋ณด์—ฌ์ค€๋‹ค. ๋ณธ ๋…ผ๋ฌธ์€ ์ด ์ •๋ฆฌ๋ฅผ ํ™•์žฅํ•˜

Quantum Physics Mathematics
A Note on the Grothendieck Group of an Additive Category

A Note on the Grothendieck Group of an Additive Category

๋งค๋ ฅ์ ์ธ ํ•œ๊ธ€ ์ œ๋ชฉ: ๊ฐ€์‚ฐ ๋ฒ”์ฃผ์™€ ๊ทธ๋กœํ…๋””ํฌ ๊ทธ๋ฃน์˜ ๋™ํ˜•์„ฑ ์ดˆ๋ก ์ „์ฒด ๋ฒˆ์—ญ ๋ฐ ์ •๋ฆฌ: ๋ณธ ๋…ผ๋ฌธ์€ ๊ฐ€์‚ฐ ๋ฒ”์ฃผ์˜ ์Šคํ”Œ๋ฆฟ ๊ทธ๋กœํ…๋””ํฌ ๊ทธ๋ฃน๊ณผ ํ•ด๋‹น ๋ฒ”์ฃผ์˜ ์œ ํ•œ ๋ณต์žก์ฒด์˜ ํ˜ธ๋ชจํ† ํ”ผ ๋ฒ”์ฃผ์—์„œ์˜ ์‚ผ๊ฐํ™”๋œ ๊ทธ๋กœํ…๋””ํฌ ๊ทธ๋ฃน์ด ๋™ํ˜•์ธ์ง€์— ๋Œ€ํ•œ ์งˆ๋ฌธ์„ ๋‹ค๋ฃฌ๋‹ค. ํŠนํžˆ, ๊ฐ€์‚ฐ ๋ฒ”์ฃผ A์™€ ๊ทธ์˜ ์œ ํ•œ ๋ณต์žก์ฒด์˜ ํ˜ธ๋ชจํ† ํ”ผ ๋ฒ”์ฃผ Kb(A)๋ฅผ ๊ณ ๋ คํ•  ๋•Œ, A์˜ ์Šคํ”Œ๋ฆฟ ๊ทธ๋กœํ…๋””ํฌ ๊ทธ๋ฃน KโŠ•(A)๊ฐ€ Kb(A)์˜ ์‚ผ๊ฐํ™”๋œ ๊ทธ๋กœํ…๋””ํฌ ๊ทธ๋ฃน Kโ–ณ(Kb(A))์™€ ๋™ํ˜•์ธ ๊ฒƒ์„ ์ฆ๋ช…ํ•œ๋‹ค. ์ด๋Š” ํ˜ธ๋ชจํ† ํ”ผ ๋ฒ”์ฃผ์—์„œ์˜ ์—์šธ๋Ÿฌ ํŠน์„ฑ์ด ์›๋ž˜ ๊ตฌ์กฐ๋ฅผ ๋ณต์›ํ•˜๋Š” ๋ฐ ์ค‘์š”ํ•œ ์—ญํ• ์„ ํ•œ๋‹ค๋Š” ์ ์—์„œ

Mathematics
No Image

A characterization of the category Q-TOP

1. ์„œ๋ก  ์„œ๋ก ์—์„œ๋Š” ์ด์ „ ์—ฐ๊ตฌ๋“ค์˜ ๋งฅ๋ฝ์„ ์ œ์‹œํ•˜๊ณ  ์žˆ๋‹ค. E.G. Manes๋Š” ํŠน์ • ์กฐ๊ฑด์„ ๋งŒ์กฑํ•˜๋Š” ์ผ๋ จ์˜ ๋ฒ”์ฃผ์— ๋Œ€ํ•ด '๊ณต๋ฆฌ์ '์ธ ํŠน์„ฑ์„ ๋ถ€์—ฌํ•˜์˜€์œผ๋ฉฐ, Srivastava์™€ Solovyov๊ฐ€ ์ด๋ฅผ ํ™•์žฅํ•˜์—ฌ

Mathematics
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

Mathematics
A Thomason-like Quillen equivalence between quasi-categories and   relative categories

A Thomason-like Quillen equivalence between quasi-categories and relative categories

: ๋ณธ ๋…ผ๋ฌธ์€ ๊ณ ๊ธ‰ ์ˆ˜ํ•™์  ๊ฐœ๋…์„ ๋ฐ”ํƒ•์œผ๋กœ ์‹œํ”Œ๋ฆฌ์–ผ ์ง‘ํ•ฉ(quasi categories)๊ณผ ์ƒ๋Œ€ ๋ฒ”์ฃผ(relative categories) ๊ฐ„์˜ ๊ด€๊ณ„๋ฅผ ํƒ๊ตฌํ•˜๊ณ  ์žˆ๋‹ค. ์ด ์—ฐ๊ตฌ๋Š” ํŠนํžˆ ์กฐ์•Œ ๋™ํ˜•์„ฑ(Quillen equivalence)์ด๋ผ๋Š” ์ค‘์š”ํ•œ ๋„๊ตฌ๋ฅผ ์‚ฌ์šฉํ•˜์—ฌ ๋‘ ๋ฒ”์ฃผ์˜ ๊ตฌ์กฐ์™€ ๊ทธ ์‚ฌ์ด์˜ ๊ด€๊ณ„๋ฅผ ๋ถ„์„ํ•œ๋‹ค. 1. ์กฐ์•Œ ๋™ํ˜•์„ฑ๊ณผ ํ†ฐ์Šจ ๋™ํ˜•์„ฑ ์กฐ์•Œ ๋™ํ˜•์„ฑ์€ ๋‘ ๋ชจ๋ธ ๋ฒ”์ฃผ(model categories) ๊ฐ„์— ์กด์žฌํ•˜๋Š” ํŠน์ • ์ข…๋ฅ˜์˜ ๋™์น˜๊ด€๊ณ„์ด๋‹ค. ์ด๋Š” ๋‘ ๋ฒ”์ฃผ์˜ ๊ตฌ์กฐ์™€ ๊ทธ ์‚ฌ์ด์˜ ๊ด€๊ณ„๋ฅผ ์ดํ•ดํ•˜๋Š”๋ฐ ์ค‘์š”ํ•œ ๋„๊ตฌ๋กœ ์‚ฌ์šฉ๋œ๋‹ค. ๋ณธ ๋…ผ๋ฌธ์—์„œ๋Š” ์กฐ

Mathematics

< Category Statistics (Total: 769) >

Electrical Engineering and Systems Science
7
General
272
General Relativity
9
HEP-EX
7
HEP-PH
12
HEP-TH
7
MATH-PH
4
NUCL-TH
1
Quantum Physics
10

Start searching

Enter keywords to search articles

โ†‘โ†“
โ†ต
ESC
โŒ˜K Shortcut