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Mirrors > Home > MPE Home > Th. List > Mathboxes > frege55cor1a | Structured version Visualization version Unicode version |
Description: Proposition 55 of [Frege1879] p. 50. (Contributed by RP, 24-Dec-2019.) (Proof modification is discouraged.) |
Ref | Expression |
---|---|
frege55cor1a |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | frege55a 38162 | . 2 if- | |
2 | frege55lem1a 38160 | . 2 if- | |
3 | 1, 2 | ax-mp 5 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wn 3 wi 4 wb 196 if-wif 1012 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-frege8 38103 ax-frege28 38124 ax-frege52a 38151 ax-frege54a 38156 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-ifp 1013 |
This theorem is referenced by: frege56a 38165 |
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