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Using the 2nd Chebyschev function for describing sums of primes

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#combinatorics #prime-numbers #logarithms #ceiling-and-floor-functions #chebyshev-function
1.9k
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Proof using Prüfer encoding

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#combinatorics #graph-theory #trees
65
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How many subgroups of $Z_2^n$ are there $\textbf{not}$ up to isomorphism?

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#combinatorics #finite-groups
124
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Probability: Drawing numbered lottery tickets

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#probability #combinatorics
45
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Functions on Finite sets and combinatorics.

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#combinatorics #functions
192
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Indistinguishable Tables

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#combinatorics
2.5k
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Two diagonals of a regular nonagon (a $9$-sided polygon) are chosen. What is the probability that their intersection lies inside the nonagon?

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#combinatorics #geometric-probability
4.1k
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What exactly are graph invariants?

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#combinatorics #discrete-mathematics #graph-theory #terminology
942
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Will 75 element subset S of $\{1, 2, 3, .\ldots, 100\}$ must contain three consecutive integers?

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#combinatorics #discrete-mathematics #pigeonhole-principle
360
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Subarray minimal average

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#combinatorics #elementary-number-theory #computational-complexity
1.4k
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For $f_n^2 - f_{n-2}^2 = f_{2n-1}$

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#combinatorics #fibonacci-numbers #combinatorial-proofs
158
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Enumerate points in a 2d and 3D triangular grid

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#combinatorics
115
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Arithmetic progression in $[1,8]$

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#combinatorics #arithmetic-progressions
198
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A combinatorial identity involving $m^n$.

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#combinatorics
171
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0-1 Knapsack problem, dependent sets, unclear proof

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#combinatorics #integer-programming #polytopes #matroids #binary-programming

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