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Mirrors > Home > NFE Home > Th. List > pm4.87 | Unicode version |
Description: Theorem *4.87 of [WhiteheadRussell] p. 122. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Eric Schmidt, 26-Oct-2006.) |
Ref | Expression |
---|---|
pm4.87 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | impexp 433 |
. . 3
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2 | bi2.04 350 |
. . 3
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3 | 1, 2 | pm3.2i 441 |
. 2
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4 | impexp 433 |
. . 3
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5 | 4 | bicomi 193 |
. 2
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6 | 3, 5 | pm3.2i 441 |
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: (None) |
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