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.
Source: wiktionary
Ranked by relevance and common usage.
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3 total sentences available.
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.
Source: wiktionary
Note in particular that a function is a bijection if and only if it's both an injection and a surjection.
Source: wiktionary
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.
Source: wiktionary
Closest matches include one to one correspondence, permutation, permutations.
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