The Doomsday rule

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The Doomsday rule A few months ago I came across the name of J. H. Conway: you're wondering who the hell he is. Well, Conway is an English mathematician active in the theory of finite groups, knot theory, number theory, combinatorial game theory and coding theory. He has also contributed to many branches of recreational mathematics and he is the invention of the Game of Life. Ah, I was forgetting one last thing: he is currently Professor Emeritus of Mathematics at Princeton University in New Jersey1.