One (number) 1 (number) One is the integer representing a single unit. This article summarizes its mathematical role as the multiplicative identity, its historical notation, and common uses and distinctio…
2 (number) The natural number two: its mathematical properties, notation, historical origins, role in computing and culture, and notable distinctions such as being the only even prime.
Aleph null (ℵ0): the smallest infinite cardinal Aleph null Aleph null (ℵ0) denotes the cardinality of the natural numbers: the first infinite cardinal. This article explains its meaning, examples, basic properties, history and key distinct…
