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Mirrors > Home > NFE Home > Th. List > pm4.71r | Unicode version |
Description: Implication in terms of biconditional and conjunction. Theorem *4.71 of [WhiteheadRussell] p. 120 (with conjunct reversed). (Contributed by NM, 25-Jul-1999.) |
Ref | Expression |
---|---|
pm4.71r |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pm4.71 611 |
. 2
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2 | ancom 437 |
. . 3
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3 | 2 | bibi2i 304 |
. 2
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4 | 1, 3 | bitri 240 |
1
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Colors of variables: wff setvar class |
Syntax hints: ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 177 df-an 360 |
This theorem is referenced by: pm4.71ri 614 pm4.71rd 616 |
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