More Turán-Type Theorems for Triangles in Convex Point Sets
More Turán-Type Theorems for Triangles in Convex Point Sets
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更多凸点集中三角形的图兰型定理
DOI:
10.37236/7224
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发表时间:
2017
期刊:
影响因子:
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通讯作者:
Luís Fernando Schultz Xavier da Silveira
中科院分区:
文献类型:
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作者:
B. Aronov;V. Dujmović;Pat Morin;Aurélien Ooms;Luís Fernando Schultz Xavier da Silveira
We study the following family of problems: Given a set of $n$ points in convex position, what is the maximum number triangles one can create having these points as vertices while avoiding certain sets of forbidden configurations. As forbidden configurations we consider all 8 ways in which a pair of triangles in such a point set can interact. This leads to 256 extremal Turán-type questions. We give nearly tight (within a $\log n$ factor) bounds for 248 of these questions and show that the remaining 8 questions are all asymptotically equivalent to Stein's longstanding tripod packing problem.