Metamath Proof Explorer
Description: If an onto function has a finite domain, its codomain/range is finite.
Theorem 37 of Suppes p. 104. (Contributed by NM, 25-Mar-2007)
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Ref |
Expression |
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Assertion |
fofi |
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Proof
Step |
Hyp |
Ref |
Expression |
1 |
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fodomfi |
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2 |
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domfi |
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3 |
1 2
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syldan |
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