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Mirrors > Home > ILE Home > Th. List > con2biddc | Unicode version |
Description: A contraposition deduction. (Contributed by Jim Kingdon, 11-Apr-2018.) |
Ref | Expression |
---|---|
con2biddc.1 |
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Ref | Expression |
---|---|
con2biddc |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | con2biddc.1 |
. . . 4
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2 | bicom 140 |
. . . 4
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3 | 1, 2 | imbitrdi 161 |
. . 3
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4 | 3 | con1biddc 876 |
. 2
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5 | bicom 140 |
. 2
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6 | 4, 5 | imbitrdi 161 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 614 ax-in2 615 ax-io 709 |
This theorem depends on definitions: df-bi 117 df-stab 831 df-dc 835 |
This theorem is referenced by: anordc 956 xor3dc 1387 |
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