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Changing powers to sums in a simple system of equations

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#combinatorics #number-theory #systems-of-equations #extremal-combinatorics #additive-combinatorics
66
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Possible outcomes for combination using two numbers (with restricted placement)

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#combinatorics #extremal-combinatorics
69
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Group a range of integers such as no pair of numbers is shared by two or more groups

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#combinatorics #extremal-combinatorics
1.1k
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What does it mean when a Hasse diagram is like a straight line?

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#discrete-mathematics #relations #order-theory #lattice-orders #extremal-combinatorics
68
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Minimal Distinct Lengths in Complete Graphs

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#combinatorics #graph-theory #plane-geometry #extremal-combinatorics
783
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Erdos Unit Distance Problem -- Maximal graphs

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#combinatorics #graph-theory #extremal-combinatorics #extremal-graph-theory
698
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What is the maximum possible sum?

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#combinatorics #discrete-optimization #extremal-combinatorics
88
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If every group of 3 students has two friends and every group of 4 has two non-friends, what is the largest possible number of students?

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#graph-theory #ramsey-theory #extremal-combinatorics
137
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Combinatorics + Diwali

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#combinatorics #extremal-combinatorics
3.8k
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Counting the number of maximal chains in a poset

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#combinatorics #extremal-combinatorics
87
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Combinatorics and Permutations

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#combinatorics #permutations #combinations #extremal-combinatorics
68
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What is the densest balanced bipartite graph without any $K_{4, 4}$?

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#combinatorics #graph-theory #extremal-combinatorics
38
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Number of ways to choose $k$ permutations of $n$ so that any two are different in every position

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#permutations #extremal-combinatorics
100
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At least ten language is spoken

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#combinatorics #extremal-combinatorics
416
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What is the mod-$3$ analogue of the solution to the Eventown problem?

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#linear-algebra #combinatorics #reference-request #extremal-combinatorics

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