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Contraction, loops and flats.

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#graph-theory #order-theory #lattice-orders #matroids #algebraic-combinatorics
116
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No minors isomorphic to $U_{0,1}$ and $U_{1,2}.$

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#combinatorics #discrete-mathematics #matroids #algebraic-combinatorics #graph-minors
86
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Hyperplane Areangements and contraction.

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#combinatorics #order-theory #algebraic-graph-theory #matroids #algebraic-combinatorics
43
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Understanding contraction in hyperplane arrangements.

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#projective-geometry #lattice-orders #affine-geometry #matroids #algebraic-combinatorics
22
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Characteristic polynomial and bounded regions.

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#projective-geometry #lattice-orders #affine-geometry #matroids #algebraic-combinatorics
21
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Lift and frame matroids.

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#reference-request #lattice-orders #algebraic-graph-theory #matroids #algebraic-combinatorics
24
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Affiness, $U_{2,4}$ and $M(K_4).$

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#projective-geometry #affine-geometry #algebraic-graph-theory #matroids #algebraic-combinatorics
49
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Restriction of induced representation over a Young subgroup and Littlewood-Richardson coefficients

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#representation-theory #symmetric-groups #algebraic-combinatorics #young-tableaux #irreducible-representation
26
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Composition of homomorphisms of association schemes

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#algebraic-combinatorics #association-schemes
104
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Can the natural proof of this algebraic identity be simplified?

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#polynomials #symmetric-functions #algebraic-combinatorics
739
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Number of permutations of $[n]$ with a multiple of $n$ inversions

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#combinatorics #algebraic-combinatorics
279
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Combinatorial Interpretation of $q$-analogue Stirling numbers?

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#combinatorics #algebraic-combinatorics
109
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Maximizing Signless Stirling Numbers

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#combinatorics #algebraic-combinatorics
206
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why $\frac{f_n}{f_kf_{n-k}}$ is an integer for this sequence

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#sequences-and-series #number-theory #fibonacci-numbers #algebraic-combinatorics
1.8k
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A Variation of the even-town odd-town problem

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#linear-algebra #combinatorics #algebraic-combinatorics

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