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Theorem dveeq2or 1694
Description: Quantifier introduction when one pair of variables is distinct. Like dveeq2 1693 but connecting by a disjunction rather than negation and implication makes the theorem stronger in intuitionistic logic. (Contributed by Jim Kingdon, 1-Feb-2018.)
Assertion
Ref Expression
dveeq2or  F/
Distinct variable group:   ,

Proof of Theorem dveeq2or
StepHypRef Expression
1 ax-i12 1395 . . . . . 6
2 orass 683 . . . . . 6
31, 2mpbir 134 . . . . 5
4 pm1.4 645 . . . . . 6
54orim1i 676 . . . . 5
63, 5ax-mp 7 . . . 4
7 orass 683 . . . 4
86, 7mpbi 133 . . 3
9 ax16 1691 . . . . . 6
109a5i 1432 . . . . 5
11 id 19 . . . . 5
1210, 11jaoi 635 . . . 4
1312orim2i 677 . . 3
148, 13ax-mp 7 . 2
15 df-nf 1347 . . . 4  F/
1615biimpri 124 . . 3  F/
1716orim2i 677 . 2  F/
1814, 17ax-mp 7 1  F/
Colors of variables: wff set class
Syntax hints:   wi 4   wo 628  wal 1240   F/wnf 1346
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 629  ax-5 1333  ax-7 1334  ax-gen 1335  ax-ie1 1379  ax-ie2 1380  ax-8 1392  ax-10 1393  ax-11 1394  ax-i12 1395  ax-4 1397  ax-17 1416  ax-i9 1420  ax-ial 1424
This theorem depends on definitions:  df-bi 110  df-nf 1347  df-sb 1643
This theorem is referenced by:  equs5or  1708  sbal1yz  1874  copsexg  3972
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