e/Zero sharp

Information
has gloss	eng: In the mathematical discipline of set theory, 0# (zero sharp, also 0#) is the set of true formulas about (order)-indiscernibles in the Gödel constructible universe. It is often encoded as a subset of the integers (using Gödel numbering), or as a subset of the hereditarily finite sets, or (somewhat misleadingly) as a real number. Its existence is unprovable in ZFC, the standard form of axiomatic set theory, but follows from a suitable large cardinal axiom. It was first introduced as a set of formulas in Silver's 1966 thesis, later published as , where it was denoted by Σ, and rediscovered by , who considered it as a subset of the natural numbers and introduced the notation 0#.
lexicalization	eng: Zero sharp
lexicalization	eng: Zero-sharp
instance of	(noun) any rational or irrational number real number, real