A Life's Work in Geometry: An Homage to Hanfried Lenz. - Impossibility of a Certain Cyclotomic Equation with Applications to Difference Sets. - On the Binary Codes of Steiner Triple Systems. - Orthogonal Partitions in Designed Experiments. - Regulus-free Spreads of Content(3 PG). - Designs Codes and CryptsA Puzzle Altogether. - 5-Cycle Systems with Holes. - Stories about Groups and Sequences. - Groups Admitting a Kantor Family and a Factorized Normal Subgroup. - Spreads in Strongly Regular Graphs. - Codes Based on Complete Graphs. - A Construction of Partial Difference Sets in $$ {\mathbb{Z}_{{{p^2}}}} \times {\mathbb{Z}_{{{p^2}}}} \times. \times {\mathbb{Z}_{{{p^2}}}} $$. - On the Characterisation of AG(n q) by its Parameters as a Nearly Triply Regular Design. - The Fundamental Theorem of q-Clan Geometry. - Extension of Gravity Centers Configuration to Steiner Triple Systems. - Constructions of Partial Difference Sets and Relative Difference Sets Using Galois Rings. - m-Systems and Partial m-Systems of Polar Spaces. - Piotrowski's Infinite Series of Steiner Quadruple Systems Revisited. Language: English