Game Theory

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Brouwers fixed point theorem with sequentially at most one fixed point

Brouwers fixed point theorem with sequentially at most one fixed point

์ด ๋…ผ๋ฌธ์€ ๋ธŒ๋ฃจ์–ด ๊ณ ์ •์  ์ •๋ฆฌ์™€ ๊ด€๋ จ๋œ ์ƒˆ๋กœ์šด ์ ‘๊ทผ๋ฒ•์„ ์†Œ๊ฐœํ•˜๋ฉฐ, ํŠนํžˆ ๊ทผ์‚ฌ ๊ณ ์ •์ ๊ณผ ์ˆœ์ฐจ์ ์œผ๋กœ ๊ฐ€์žฅ ํฐ ๊ฐ’์ด ํ•˜๋‚˜์ธ ์กฐ๊ฑด์— ์ดˆ์ ์„ ๋งž์ถ˜๋‹ค. ์ด๋Ÿฌํ•œ ์ ‘๊ทผ๋ฒ•์€ ๊ธฐ์กด์˜ ๋ธŒ๋ฃจ์–ด ํŒฌ ์ •๋ฆฌ๋ฅผ ํ™•์žฅํ•˜๊ณ , ์ด๋ฅผ ํ†ตํ•ด ์ œ๋กœ์„ฌ ๊ฒŒ์ž„์—์„œ ์ตœ์  ์ „๋žต์„ ์ฐพ๋Š” ๋ฐฉ๋ฒ•์„ ์ œ์‹œํ•œ๋‹ค. 1. ๋ธŒ๋ฃจ์–ด ๊ณ ์ •์  ์ •๋ฆฌ์™€ ๊ทผ์‚ฌ ๋ฒ„์ „ ๋ธŒ๋ฃจ์–ด ๊ณ ์ •์  ์ •๋ฆฌ๋Š” ๋น„์Šˆํ”ผ์ฒ˜ ์ˆ˜ํ•™์—์„œ ๊ฑด์„ค์ ์œผ๋กœ ์ฆ๋ช…๋  ์ˆ˜ ์—†๋‹ค๋Š” ๊ฒƒ์ด ์ž˜ ์•Œ๋ ค์ ธ ์žˆ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ ์Šคํผ๋„ˆ์˜ ํ•จ์ˆ˜๋ฅผ ์ด์šฉํ•˜์—ฌ ๊ทผ์‚ฌ ๋ฒ„์ „์„ ์ œ์‹œํ•  ์ˆ˜ ์žˆ๋‹ค๋Š” ์ ์ด ์ค‘์š”ํ•˜๋‹ค. ์ด ๋…ผ๋ฌธ์—์„œ๋Š” ์ด๋Ÿฌํ•œ ๊ทผ์‚ฌ ๋ฒ„์ „์„ ํ†ตํ•ด ๋ธŒ๋ฃจ์–ด ๊ณ ์ •์  ์ •๋ฆฌ๋ฅผ ๊ฑด์„ค์ ์œผ๋กœ ์ฆ

Mathematics Game Theory Computer Science
The Unlucky Door

The Unlucky Door

๋ณธ ๋…ผ๋ฌธ์€ ๋ชฌํ‹ฐ ํ™€ ๋ฌธ์ œ๋ฅผ ๊ธฐ๋ฐ˜์œผ๋กœ ํ•œ ๊ฒŒ์ž„ ์ด๋ก ์  ์ ‘๊ทผ๋ฒ•๊ณผ ๋‹ค์–‘ํ•œ ๋ณ€ํ˜•์— ๋Œ€ํ•ด ์‹ฌ๋„ ์žˆ๊ฒŒ ๋ถ„์„ํ•˜๊ณ  ์žˆ๋‹ค. ํŠนํžˆ, ์„ธ ๋ฌธ ๊ฒŒ์ž„์—์„œ ์ฝ˜์ด์™€ ๋ชฌํ…Œ์˜ ์ƒํ˜ธ์ž‘์šฉ์„ ์กฐํ•ฉ์ ์œผ๋กœ ๋ถ„์„ํ•˜๋ฉฐ, ๋„ค ๊ฐœ ์ด์ƒ์˜ ๋ฌธ์„ ํฌํ•จํ•œ ํ™•์žฅ๋œ ๋ฒ„์ „์—์„œ๋Š” ํ˜‘๋ ฅ์ ์ธ ์ „๋žต์„ ์ œ์‹œํ•œ๋‹ค. 1. ์„ธ ๋ฌธ ๊ฒŒ์ž„ ๋ถ„์„ ์„ธ ๋ฌธ ๊ฒŒ์ž„์€ ํ€ด์ฆˆ ํŒ€์ด ํ•œ ๋ฌธ ๋’ค์— ์ƒํ’ˆ์„ ์ˆจ๊ธฐ๊ณ , ์ฝ˜์ด๊ฐ€ ์ฒซ ๋ฒˆ์งธ ์„ ํƒ์œผ๋กœ ๋ฌธ ํ•˜๋‚˜๋ฅผ ๊ณ ๋ฅธ๋‹ค. ๋ชฌํ…Œ๋Š” ์ƒํ’ˆ์ด ์•„๋‹Œ ๋‹ค๋ฅธ ๋ฌธ์„ ๊ณต๊ฐœํ•˜๊ณ , ์ฝ˜์ด๋Š” ์ž์‹ ์˜ ์„ ํƒ์„ ์œ ์ง€ํ•˜๊ฑฐ๋‚˜ ๋ณ€๊ฒฝํ•  ์ˆ˜ ์žˆ๋‹ค. ์ด ๊ฒŒ์ž„์—์„œ ์ฝ˜์ด์˜ ์ „๋žต์€ ์ƒํ™ฉ์— ๋”ฐ๋ผ ๋‹ฌ๋ผ์ง€๋ฉฐ, ์˜ˆ๋ฅผ ๋“ค์–ด '1ss'์™€ ๊ฐ™

Game Theory Mathematics Computer Science
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How to Lose with Least Probability

: ์ด ๋…ผ๋ฌธ์€ ์•จ๋ฆฌ์Šค์™€ ๋ฐฅ์ด ์ฐธ์—ฌํ•˜๋Š” ๊ฒŒ์ž„์—์„œ ์•จ๋ฆฌ์Šค๊ฐ€ ์Šน๋ฆฌํ•  ํ™•๋ฅ  I(p | n, ฮฑ, ฮฒ)๋ฅผ ์ˆ˜ํ•™์ ์œผ๋กœ ๋ถ„์„ํ•˜๊ณ  ์ตœ์ ์˜ ๋™์ „ ํŽธํ–ฅ์„ ์ฐพ๋Š” ๋ฐฉ๋ฒ•์„ ์ œ์‹œํ•œ๋‹ค. ์ด ๊ฒŒ์ž„์€ ํ”Œ๋ ˆ์ด์–ด๋“ค์ด ๋ฒˆ๊ฐˆ์•„๊ฐ€๋ฉฐ ๋™์ „์„ ๋˜์ ธ ๊ผฌ๋ฆฌ์— ฮฑ ํฌ์ธํŠธ, ๋จธ๋ฆฌ์— ฮฑ + ฮฒ ํฌ์ธํŠธ๋ฅผ ํš๋“ํ•˜๋ฉฐ, ๋จผ์ € n ํฌ์ธํŠธ๋ฅผ ์–ป๋Š” ํ”Œ๋ ˆ์ด์–ด๊ฐ€ ์Šน๋ฆฌํ•˜๋Š” ๋ฐฉ์‹์œผ๋กœ ์ง„ํ–‰๋œ๋‹ค. ๋…ผ๋ฌธ์€ I(p | n, ฮฑ, ฮฒ)์˜ ์„ฑ์งˆ์„ ๋ถ„์„ํ•˜๊ณ  ์ด๋ฅผ ์ตœ์†Œํ™”ํ•˜๋Š” ๋™์ „ ํŽธํ–ฅ p n์— ๋Œ€ํ•ด ๊นŠ์ด ์žˆ๊ฒŒ ๋‹ค๋ฃฌ๋‹ค. ๊ฒŒ์ž„์˜ ๊ธฐ๋ณธ ์›์น™๊ณผ ์ˆ˜ํ•™์  ๋ชจ๋ธ๋ง ๊ฒŒ์ž„์—์„œ ์•จ๋ฆฌ์Šค์™€ ๋ฐฅ์€ ๋ฒˆ๊ฐˆ์•„๊ฐ€๋ฉฐ ๋™์ „์„ ๋˜์ง„๋‹ค. ๋™์ „์˜ ๋จธ๋ฆฌ๋‚˜

Computer Science Mathematics Game Theory
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Dominance in the Monty Hall Problem

๋งค๋ ฅ์ ์ธ ํ•œ๊ธ€ ์ œ๋ชฉ: ๋ชฌํ‹ฐ ํ™€ ๋ฌธ์ œ์—์„œ ์ „๋žต์˜ ์ง€๋ฐฐ์„ฑ๊ณผ ์ตœ์ ์„ฑ ์ดˆ๋ก ์ „์ฒด ๋ฒˆ์—ญ ๋ฐ ์ •๋ฆฌ: ๋ชฌํ‹ฐ ํ™€ ๋ฌธ์ œ๋Š” ์„ธ ๊ฐœ์˜ ๋ฌธ ์ค‘ ํ•˜๋‚˜๊ฐ€ ์ƒ์„ ์ˆจ๊ธฐ๊ณ , ๋‚˜๋จธ์ง€ ๋‘ ๋ฌธ์€ ํ—ˆ์šธ๋ฟ์ธ ๋‹ต๋ณ€์„ ์ œ๊ณตํ•˜๋Š” ๊ณ ์ „์ ์ธ ํ™•๋ฅ  ๋ฌธ์ œ๊ฐ€๋ฉฐ, ํ”Œ๋ ˆ์ด์–ด๋Š” ํ•œ ๋ฌธ์„ ์„ ํƒํ•˜๊ณ  ์ง„ํ–‰์ž๋Š” ์„ ํƒํ•˜์ง€ ์•Š์€ ๋ฌธ ์ค‘ ํ•˜๋‚˜๋ฅผ ์—ด์–ด ์ƒ์ด ์—†๋Š” ๊ฒƒ์„ ๋“œ๋Ÿฌ๋‚ด๋ฉฐ, ์ดํ›„ ํ”Œ๋ ˆ์ด์–ด์—๊ฒŒ ์„ ํƒํ•œ ๋ฌธ์„ ๊ณ ์ˆ˜ํ• ์ง€ ๋‹ค๋ฅธ ๋ฌธ์œผ๋กœ ์ „ํ™˜ํ• ์ง€๋ฅผ ๊ฒฐ์ •ํ•˜๊ฒŒ ํ•ฉ๋‹ˆ๋‹ค. ๋ณธ ๋…ผ๋ฌธ์—์„œ๋Š” ์ด ๋ฌธ์ œ์— ๋‚ด์žฌ๋œ ์ง€๋ฐฐ์„ฑ ๊ฐœ๋…์„ ๋ถ„์„ํ•˜๊ณ , ํ•ญ์ƒ ์ „ํ™˜ ์ „๋žต์˜ ์ตœ์ ์„ฑ์„ ์ฆ๋ช…ํ•˜๋ฉฐ, ๋ฒ ์ด์ฆˆ์•ˆ ๊ด€์ ์—์„œ ์ตœ์ ์˜ ์ „๋žต์„ ํƒ๊ตฌํ•ฉ๋‹ˆ๋‹ค. ์‹ฌ๋„ ๋ถ„์„

Computer Science Mathematics Game Theory
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The Optimal Sample Complexity of Linear Contracts

์ด ๋…ผ๋ฌธ์€ ๋””์ง€ํ„ธ ์Œ์•… ํ”Œ๋žซํผ์—์„œ ์ƒˆ๋กœ์šด ๋กœ์—ดํ‹ฐ ๋ชจ๋ธ ๋„์ž…์— ๋Œ€ํ•œ ํ•ต์‹ฌ ๋ฌธ์ œ, ์ฆ‰ ๋ถˆํ™•์‹คํ•œ ์•„ํ‹ฐ์ŠคํŠธ ํŠน์„ฑ์˜ ํ•™์Šต์„ ๋‹ค๋ฃจ๋ฉฐ, ์ด๋ฅผ ์œ„ํ•œ ์ตœ์  ์ƒ˜ํ”Œ ๋ณต์žก๋„๋ฅผ ๋ถ„์„ํ•˜๊ณ  ์ œ์‹œํ•ฉ๋‹ˆ๋‹ค. ๋…ผ๋ฌธ์€ (Dรผtting ๋“ฑ, 2025)์˜ ํ‘œ๋ณธ ๊ธฐ๋ฐ˜ ํ•™์Šต ํ”„๋ ˆ์ž„์›Œํฌ๋ฅผ ํ™•์žฅํ•˜์—ฌ ์„ ํ˜• ๊ณ„์•ฝ์ด๋ผ๋Š” ํŠน์ • ๊ณ„์•ฝ ํด๋ž˜์Šค์— ๋Œ€ํ•œ ์ตœ์  ํ•™์Šต์„ ์œ„ํ•œ ์ƒ˜ํ”Œ ๋ณต์žก๋„๋ฅผ ๋ถ„์„ํ•˜๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค. ๊ธฐ์ˆ ์  ํ˜์‹ ์„ฑ: ๋…ผ๋ฌธ์€ ๋””์ง€ํ„ธ ์Œ์•… ํ”Œ๋žซํผ์ด ์ƒˆ๋กœ์šด ๋กœ์—ดํ‹ฐ ๋ชจ๋ธ์„ ๋„์ž…ํ•  ๋•Œ ์ง๋ฉดํ•˜๋Š” ํ•ต์‹ฌ ๋ฌธ์ œ์ธ ๋ถˆํ™•์‹คํ•œ ์•„ํ‹ฐ์ŠคํŠธ ํŠน์„ฑ์˜ ํ•™์Šต์„ ํ•ด๊ฒฐํ•˜๊ธฐ ์œ„ํ•œ ๋ฐฉ๋ฒ•๋ก ์„ ์ œ์‹œํ•ฉ๋‹ˆ๋‹ค. ํŠนํžˆ, ์ด ๋…ผ๋ฌธ์—์„œ ์ œ์•ˆ

Computer Science Game Theory
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Sparse Probabilistic Coalition Structure Generation: Bayesian Greedy Pursuit and $ell_1$ Relaxations

์ด ๋…ผ๋ฌธ์€ ์—ฐํ•ฉ ๊ตฌ์กฐ ์ƒ์„ฑ(CSG) ๋ฌธ์ œ์— โ€˜๊ฐ€์น˜๊ฐ€ ๊ด€์ธก์„ ํ†ตํ•ด ํ•™์Šต๋ผ์•ผ ํ•œ๋‹คโ€™๋Š” ์ƒˆ๋กœ์šด ์ „์ œ๋ฅผ ๋„์ž…ํ•จ์œผ๋กœ์จ ๊ธฐ์กด ์—ฐ๊ตฌ์™€ ์ฐจ๋ณ„ํ™”ํ•œ๋‹ค. ์ „ํ†ต์ ์ธ CSG๋Š” ๋ชจ๋“  ๊ฐ€๋Šฅํ•œ ์—ฐํ•ฉ์— ๋Œ€ํ•œ ์ •ํ™•ํ•œ ๊ฐ€์น˜ ํ•จ์ˆ˜๊ฐ€ ์ฃผ์–ด์กŒ๋‹ค๊ณ  ๊ฐ€์ •ํ•˜๊ณ , ๊ทธ ์œ„์—์„œ ์ตœ์ ์˜ ์—ฐํ•ฉ ๋ถ„ํ• ์„ ์ฐพ๋Š”๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ ์‹ค์ œ ์‚ฌํšŒยท๊ฒฝ์ œ ์‹œ์Šคํ…œ์—์„œ๋Š” ๊ฐœ๋ณ„ ์—ฐํ•ฉ์˜ ๊ฐ€์น˜๋ฅผ ์ง์ ‘ ์ธก์ •ํ•˜๊ธฐ ์–ด๋ ต๊ณ , ๋Œ€์‹  ์—ฌ๋Ÿฌ ์—ํ”ผ์†Œ๋“œ(์˜ˆ: ํ˜‘์ƒ ๋ผ์šด๋“œ, ํ”„๋กœ์ ํŠธ ์ˆ˜ํ–‰ ๊ฒฐ๊ณผ)์—์„œ ์–ป์€ ์ด ๋ณด์ƒ๋งŒ ๊ด€์ฐฐ๋œ๋‹ค. ์ €์ž๋“ค์€ ์ด๋Ÿฌํ•œ ์ƒํ™ฉ์„ โ€˜ํฌ์†Œ ์„ ํ˜• ํšŒ๊ท€โ€™ ๋ชจ๋ธ๋กœ ์ •ํ˜•ํ™”ํ•œ๋‹ค. ์ฆ‰, ํ•œ ์—ํ”ผ์†Œ๋“œ์˜ ์ด ๋ณด์ƒ Yโ‚œ๋Š” ์†Œ์ˆ˜(K)๊ฐœ

Computer Science Game Theory

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