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bijection (plural bijections)
- (set theory) A one-to-one correspondence, a function which is both a surjection and an injection.
- 2002, Yves Nievergelt, Foundations of Logic and Mathematics, page 214:
- The present text has defined a set to be finite if and only if there exists a bijection onto a natural number, and infinite if and only if there does not exist any such bijection.
- 2007, C. J. Date, Logic and Databases: The Roots of Relational Theory, page 167:
- Note in particular that a function is a bijection if and only if it's both an injection and a surjection.
- 2013, William F. Basener, Topology and Its Applications, unnumbered page:
- The basic idea is that two sets A and B have the same cardinality if there is a bijection from A to B. Since the domain and range of the bijection is not relevant here, we often refer to a bijection from A to B as a bijection between the sets, or a one-to-one correspondence between the elements of the sets.
function that is both a surjection and an injection
bijection f (plural bijections)