The finite promise games are a collection of mathematical games developed by American mathematician Harvey Friedman in 2009 which are used to develop a family of fast-growing functions , and . The greedy clique sequence is a graph theory concept, also developed by Friedman in 2010, which are used to develop fast-growing functions , and .
represents the theory of ZFC plus, the infinite family of axioms "there exists a strongly -Mahlo cardinal for all positive integers . and represents the theory of ZFC plus "for each , there is a strongly -Mahlo cardinal". represents the theory of ZFC plus, for each , "there is a -stationary Ramsey cardinal", and represents the theory of ZFC plus "for each , there is a strongly -stationary Ramsey cardinal". represents the theory of ZFC plus, for each , "there is a -huge cardinal", and represents the theory of ZFC plus "for each , there is a strongly -huge cardinal".