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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 | DECID |
Ref | Expression |
---|---|
con2biddc | DECID |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | con2biddc.1 | . . . 4 DECID | |
2 | bicom 138 | . . . 4 | |
3 | 1, 2 | syl6ib 159 | . . 3 DECID |
4 | 3 | con1biddc 803 | . 2 DECID |
5 | bicom 138 | . 2 | |
6 | 4, 5 | syl6ib 159 | 1 DECID |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wb 103 DECID wdc 775 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 |
This theorem depends on definitions: df-bi 115 df-dc 776 |
This theorem is referenced by: anordc 897 xor3dc 1318 |
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