5 citations · 5 across the 2 of their papers we have counts for
2 papers
math.CO2002
David Gale's subset take-away game
J. Daniel Christensen, Mark Tilford
Subset take-away is a two-player game involving a fixed finite set A. Players alternate choosing a proper, non-empty subset of A, with the condition that one may not name a set con…
math.AT2001★ 5 cited
Obstruction Theory in Model Categories
J. Daniel Christensen, William G. Dwyer, Daniel C. Isaksen
Many examples of obstruction theory can be formulated as the study of when a lift exists in a commutative square. Typically, one of the maps is a cofibration of some sort and the o…