Hark! The Herald Angels Sing

Wilson’s Theorem is a test for primality.  It is inefficient for large numbers since factorials () grow very fast.  Nevertheless, it has its uses because of its simplicity. It was conjectured by Wilson and published [more…]

The third Sunday of Advent – #Peace. Maestà, or Maestà of Duccio is an altarpiece composed of many individual paintings commissioned by the city of Siena in 1308 from the artist Duccio di Buoninsegna, 1308–1311 [more…]

One sometimes gets very interesting results when one turns divergent sums upside down. The Basel problem was asked by Pietro Mengoli in . He asked what is the exact summation of the reciprocals of the [more…]