5 research outputs found

    p-ν–‰κ·Έλž˜ν”„μ™€ p-κ²½μŸκ·Έλž˜ν”„

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    ν•™μœ„λ…Όλ¬Έ (석사)-- μ„œμšΈλŒ€ν•™κ΅ λŒ€ν•™μ› : μ‚¬λ²”λŒ€ν•™ μˆ˜ν•™κ΅μœ‘κ³Ό, 2019. 2. κΉ€μ„œλ Ή.For a positive integer pp, the pp-competition graph of a digraph DD is a graph which has the same vertex set as DD and an edge between distinct vertices xx and yy if and only if xx and yy have at least pp common out-neighbors in DD. A graph is said to be a pp-competition graph if it is the pp-competition graph of a digraph. In this paper, we introduce { the notions of pp-row graph of a matrix and competition-realizer for a graph} to study pp-competition graphs. {Using these notions}, we study the competition-realizers of various graphs to extend results given by Kim {\it et al.}~[pp-competition graphs, {\it Linear Algebra Appl.} {\bf 217} (1995) 167--178]. Especially, we completely characterize the competition-realizers for caterpillars.μ–‘μ˜ μ •μˆ˜ pp에 λŒ€ν•΄, μ–΄λ–€ 유ν–₯κ·Έλž˜ν”„ DD의 pp-κ²½μŸκ·Έλž˜ν”„λŠ” κΌ­μ§“μ μ˜ 집합을 DD와 같이 κ°–κ³  두 꼭짓점 xx와 yyκ°€ λ³€μœΌλ‘œ μ΄μ–΄μ§ˆ ν•„μš”μΆ©λΆ„μ‘°κ±΄μ„ xx와 yyκ°€ μ΅œμ†Œν•œ pp개 μ΄μƒμ˜ κ³΅ν†΅λœ 외이웃을 κ°€μ§€λŠ” κ²ƒμœΌλ‘œ ν•˜λŠ” κ·Έλž˜ν”„λ‘œ μ •μ˜λœλ‹€. μ–΄λ–€ κ·Έλž˜ν”„ GG에 λŒ€ν•΄ μ–΄λ–€ 유ν–₯κ·Έλž˜ν”„ DDκ°€ μ‘΄μž¬ν•΄μ„œ GGκ°€ DD의 pp-κ²½μŸκ·Έλž˜ν”„κ°€ 될 λ•Œ GGλ₯Ό pp-κ²½μŸκ·Έλž˜ν”„λΌκ³  λΆ€λ₯Έλ‹€. κ·Έλž˜ν”„ GGκ°€ μ£Όμ–΄μ‘Œμ„ λ•Œ, GGκ°€ pp-κ²½μŸκ·Έλž˜ν”„κ°€ λ˜λŠ” μ–‘μ˜ μ •μˆ˜ pp의 집합을 GG의 κ²½μŸμ‹€ν˜„μ§‘ν•©μ΄λΌκ³  μ •μ˜ν•œλ‹€. κ·Έλž˜ν”„ GG에 λŒ€ν•΄μ„œ μ„œλ‘œ 같은 λ‹«νžŒ 외이웃을 κ°–λŠ” μΈμ ‘ν•œ 꼭짓점을 λ™μΌμ‹œν•˜μ—¬ 얻은 κ·Έλž˜ν”„λ₯Ό G/β€‰β£β€‰β£βˆΌG/\!\!\sim으둜 λ‚˜νƒ€λ‚Έλ‹€. λ³Έ μ—°κ΅¬μ—μ„œλŠ” 기쑴의 ν–‰κ·Έλž˜ν”„μ— λŒ€ν•œ κ°œλ…μ„ ν™•μž₯ν•œ pp-ν–‰κ·Έλž˜ν”„λ₯Ό λ„μž…ν•˜μ˜€κ³ , pp-ν–‰κ·Έλž˜ν”„μ™€ G/β€‰β£β€‰β£βˆΌG/\!\!\sim을 μ΄μš©ν•˜μ—¬ λ‹€μ–‘ν•œ κ·Έλž˜ν”„μ˜ κ²½μŸμ‹€ν˜„μ§‘ν•©μ„ μ°Ύμ•„λ‚΄μ—ˆμœΌλ©° 기쑴의 μ—°κ΅¬μ—μ„œ λ‚˜μ™”λ˜ 결과듀을 ν™•μž₯ν•˜μ˜€μœΌλ©° μˆ˜ν˜•λ„μ˜ 일쒅인 μΊν„°ν•„λŸ¬μ˜ κ²½μŸμ‹€ν˜„μ§‘ν•©μ˜ λͺ¨λ“  μ›μ†Œλ₯Ό μ°Ύμ•„λ‚΄μ—ˆλ‹€.1. Introduction 2. pp-row graphs and competition-realizers 3. Competition-realizers for trees 4. Closing RemarksMaste

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