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The maximum dimension of a subspace of nilpotent matrices of index 2

Strong edge-magic graphs of maximum size

Strong VMTLs of odd order 2-regular graphs

All regular graphs of small odd order are vertex-magic

Vertex-magic labelings of regular graphs II

Sparse semi-magic squares and vertex-magic labelings

Sparse anti-magic squares and vertex-magic labelings of bipartite graphs

Vertex-magic labelings: mutations

Minimally triangle-saturated graphs: adjoining a single vertex

Principal rank plateaux in the integers beyond 10¹²

Consecutive integers with equally many principal divisors

Principal divisor ranks of the first trillion positive integers

Runs of integers with equally many distinct prime factors

Graphs which are linked structures

Rational tetrahedra with edges in arithmetic progression

Rational and Heron tetrahedra

Rational tetrahedra with edges in geometric progression

Cyclic polygons with rational sides and area

Heron quadrilaterals with sides in arithmetic or geometric progression

Structure of graph posets for orders 4 to 8

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