Meanings (ES + gloss)
biyección
A one-to-one correspondence, a function which is both a surjection and an injection.
Note in particular that a function is a bijection if and only if it's both an injection and a surjection.
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.
Phrases
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Word forms