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Mirrors > Home > ILE Home > Th. List > funforn | Unicode version |
Description: A function maps its domain onto its range. (Contributed by NM, 23-Jul-2004.) |
Ref | Expression |
---|---|
funforn |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | funfn 5242 |
. 2
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2 | dffn4 5440 |
. 2
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3 | 1, 2 | bitri 184 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-gen 1449 ax-ext 2159 |
This theorem depends on definitions: df-bi 117 df-cleq 2170 df-fn 5215 df-fo 5218 |
This theorem is referenced by: dvrecap 13841 |
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