David Whitteridge, 22 June 1912 - 15 June 1994

David Whitteridge: 22 June 1912 - 15 June 1994.

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David Guthrie Catcheside - 31 May 1907--1 June 1994.

Submitted: June 15, 1994; Accepted: April 5, 1995

The analysis of chessboard pebbling by Andrew Odlyzko is strengthened and generalized, rst to higher dimension and then to arbitrary posets. 1 The pebbling game The pebbling game of Kontsevich is played on the grid points of the rst quadrant. One starts with a single pebble on the origin and a move consists of replacing any pebble with two pebbles, one above and one to the right of the vanishin...

In Memoriam: Edmund Pellegrino (June 22, 1920-June 13, 2013)

Cover vol. 15, no. 3, June 2018