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Mirrors > Home > ILE Home > Th. List > dfor2dc | Unicode version |
Description: Logical 'or' expressed in terms of implication only, for a decidable proposition. Based on theorem *5.25 of [WhiteheadRussell] p. 124. (Contributed by Jim Kingdon, 27-Mar-2018.) |
Ref | Expression |
---|---|
dfor2dc |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pm2.62 703 |
. 2
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2 | pm2.68dc 832 |
. 2
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3 | 1, 2 | impbid2 142 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 580 ax-in2 581 ax-io 666 |
This theorem depends on definitions: df-bi 116 df-dc 782 |
This theorem is referenced by: imimorbdc 834 |
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