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15
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Counting restricted ordered rooted trees by the number of leaves and non-leaves

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#combinatorics #algebraic-combinatorics
118
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Formula for $q$-Analogue of Eulerian Polynomial

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#combinatorics #algebraic-combinatorics #q-analogs #eulerian-numbers
850
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A question on Derangement Combinatorics

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#combinatorics #algebraic-combinatorics #derangements #arithmetic-combinatorics
63
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Orbital dimension of the action of $S_n$ on 2-subsets

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#combinatorics #discrete-mathematics #algebraic-graph-theory #algebraic-combinatorics
130
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Proving Crapo's Lemma

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#abstract-algebra #combinatorics #lattice-orders #algebraic-combinatorics
134
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No triangles or rectangles in a Moore graph of diameter 2.

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#graph-theory #algebraic-combinatorics
727
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Proof that Paley Graphs are strongly regular with parameters $(p,\frac{p-1}{2},\frac{p-5}{4},\frac{p-1}{4})$

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#discrete-mathematics #graph-theory #algebraic-combinatorics
38
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Reference for a Dickson Determinant Polynomial

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#combinatorics #polynomials #ring-theory #algebraic-combinatorics
288
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Is there a synthetic definition of the $0$-Hecke monoid of $S_n$?

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#symmetric-groups #monoid #algebraic-combinatorics #hecke-algebras
212
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How many degree m elements in the exterior algebra on n generators over a finite field, vanish when raised to the r-th power?

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#combinatorics #noncommutative-algebra #algebraic-combinatorics
13.9k
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Undergrad-level combinatorics texts easier than Stanley's Enumerative Combinatorics?

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#combinatorics #reference-request #book-recommendation #algebraic-combinatorics
69
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How to prove Crapo's Lemma

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#combinatorics #lattice-orders #mobius-inversion #algebraic-combinatorics
393
Views

How to prove this $p^{j-\left\lfloor\frac{k}{p}\right\rfloor}\mid c_{j}$

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#number-theory #polynomials #binomial-coefficients #algebraic-combinatorics
722
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Expressions for symmetric power sums in terms of lower symmetric power sums

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#abstract-algebra #combinatorics #recurrence-relations #algebraic-combinatorics
95
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Given a matrix $A$ such that $A^{\ell}$ is a constant matrix, must $A$ be a constant matrix?

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#linear-algebra #matrices #algebraic-combinatorics

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