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Injective: A function where no element on the domain is many to one.

Surjective: All the elements in the codomain have at least one element from the domain that maps to them.

I'd like to keep it simple so I can play it back to myself in the exam, rather than trying to understand a formal definition, so I hope it's ok so far..

Then

Bijection: Any map where there is no many to one elements in the Domain, but all the elements in the co-domain have at least one element mapped to them.