$q$-Rook polynomials and matrices over finite fields

$q,t$-Catalan numbers and generators for the radical ideal defining the diagonal locus of $(\C^2)^n$

$Q_2$-free families in the Boolean lattice

$R$-polynomials of finite monoids of Lie type

$SL_2(k)$ and a Subset of Words over $k$

$SL_k$-Tiling of the Plane

$\LE$-diagrams and totally positive bases inside the nonnegative Grassmannian

$\mathbb{Z}_{2}^{2}$-cordiality of complete and complete bipartite graphs

${5\choose 2}$ Proofs that ${n\choose k} \leq {n\choose {k+1}}$ if $k<n/2$

$Δ+300$ is a Bound on the Adjacent Vertex Distinguishing Edge Chromatic Number

$λ$-factorials of $n$

$π$-formulas with free parameters

$ψ$-Appell polynomials` solutions of an umbral difference nonhomogeneous equation

$ψ$-Poisson, $q$-Cigler, $ψ$-Dobinski, $ψ$-Rota and $ψ$-coherent states

'Congruent Partitions' of Polygons - a Short Introduction

'Fair' Partitions of Polygons - an Introduction

($\ell,0)$-Carter partitions, a generating function, and their crystal theoretic interpretation

(-1)-enumeration of plane partitions with complementation symmetry

(-1)-enumeration of self-complementary plane partitions

(1,λ)-embedded graphs and the acyclic edge choosability