26-letter words containing s, t, y, l, a, r
- university of pennsylvania — (body, education) The home of ENIAC and Machiavelli. Address: Philadelphia, PA, USA.
- voluntary service overseas — an organization that sends young volunteers to use and teach their skills in developing countries
- zermelo fränkel set theory — (mathematics) A set theory with the axioms of Zermelo set theory (Extensionality, Union, Pair-set, Foundation, Restriction, Infinity, Power-set) plus the Replacement axiom schema: If F(x,y) is a formula such that for any x, there is a unique y making F true, and X is a set, then {F x : x in X} is a set. In other words, if you do something to each element of a set, the result is a set. An important but controversial axiom which is NOT part of ZF theory is the Axiom of Choice.