I heard about these online courses by Bob Sedgewick through Moshe Vardi's post on G+.
How to handle journal referees who ask authors to add unjustified citations to their own papers? Is their misbehavior protected by the anonymity of peer review or can they be publicly named and shamed? https://retractionwatch.com/2019/02/07/the-case-of-the-reviewer-who-said-cite-me-or-i-wont-recommend-acceptance-of-your-work/
The 2019 Bridges mathematical art gallery is online! http://gallery.bridgesmathart.org/exhibitions/2019-joint-mathematics-meetings
Lots of good stuff in there...in https://twitter.com/bit_player/status/1086463227154915329, Brian Hayes lists his favorites as being the warped notepaper of Matt Enlow (http://gallery.bridgesmathart.org/exhibitions/2019-joint-mathematics-meetings/unsolvedmre) and the Penrose quilt of Douglas G. Burkholder (http://gallery.bridgesmathart.org/exhibitions/2019-joint-mathematics-meetings/burkholderd)
I am interested in designing and analyzing algorithms, particularly distributed algorithms.
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