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Mirrors > Home > ILE Home > Th. List > xornbidc | Unicode version |
Description: Exclusive or is equivalent to negated biconditional for decidable propositions. (Contributed by Jim Kingdon, 27-Apr-2018.) |
Ref | Expression |
---|---|
xornbidc | DECID DECID |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | xor2dc 1321 | . . . 4 DECID DECID | |
2 | 1 | imp 122 | . . 3 DECID DECID |
3 | df-xor 1307 | . . 3 | |
4 | 2, 3 | syl6rbbr 197 | . 2 DECID DECID |
5 | 4 | ex 113 | 1 DECID DECID |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wa 102 wb 103 wo 661 DECID wdc 775 wxo 1306 |
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 df-xor 1307 |
This theorem is referenced by: xordc 1323 xordidc 1330 |
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