The definition of a great puzzle is simplicity and yet that it has many permutations. John Dore has developed puzzles ba......more

In a time of dire need, as climate change, conflict, and economic upheaval imperil our existence and our mental well-bei......more

A fundamental property of permutability is expressed in the following theorem: Two functions permutable with a third are......more

"A Defence of Free-Thinking in Mathematics" is an influential work by the philosopher George Berkeley, published in 1735......more

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Essential math test prep for this college entrance exam and the quickest and most complete review possible in just six l......more