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Mirrors > Home > NFE Home > Th. List > pm4.53 | Unicode version |
Description: Theorem *4.53 of [WhiteheadRussell] p. 120. (Contributed by NM, 3-Jan-2005.) |
Ref | Expression |
---|---|
pm4.53 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pm4.52 477 |
. . 3
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2 | 1 | con2bii 322 |
. 2
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3 | 2 | bicomi 193 |
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-or 359 df-an 360 |
This theorem is referenced by: undif3 3516 |
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