Stories by Martin Gardner

Dr. Matrix returns, now in the guise of a neo-Freudian psychonumeranalyst

Magic stars, graphs and polyhedrons, and answers to last month's problems

A selection of elementary word and number problems

Pentolninoes and polyominoes: five games and a sampling of problems

The superellipse: a curve that lies between the ellipse and the rectangle

Thoughts on the task of communication with intelligent organisms on other worlds

On the relation between mathematics and the ordered patterns of Op art

Some diversions and problems from Mr. O'Gara, the postman

The lattice of integers considered as an orchard or a billiard table

The infinite regress in philosophy, literature and mathematical proof

A new group of short problems and answers to last month's questions

Tetrahedrons in nature and architecture, and puzzles involving this simplest polyhedron

Some comments by Dr. Matrix on symmetries and reversals

On polyiamonds: shapes that are made out of equilateral triangles

Some paradoxes and puzzles involving infinite series and the concept of limit

Simple proofs of the Pythagorean theorem, and sundry other matters

Puns, palindromes and other word games that partake of the mathematical spirit

Concerning several magic tricks based on mathematical principles

Curious properties of a cycloid curve

A collection of short problems and more talk of prime numbers

The tyranny of 10 overthrown with the ternary number system

Various problems based on planar graphs, or sets of "vertices" connected by "edges"

The remarkable lore of the prime numbers

The hypnotic fascination of sliding-block puzzles