dveeq2 - Intuitionistic Logic Explorer

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Theorem dveeq2 1868

Description: Quantifier introduction when one pair of variables is distinct. (Contributed by NM, 2-Jan-2002.)

**Assertion**
Ref	Expression
dveeq2

**Proof of Theorem dveeq2**
Step	Hyp	Ref	Expression
1		ax12or 1561	. . . . 5 $\/$ $\/$
2		orcom 740	. . . . . 6 $\/$ $\/$
3	2	orbi2i 774	. . . . 5 $\/$ $\/$ $\/$ $\/$
4	1, 3	mpbi 145	. . . 4 $\/$ $\/$
5		orass 779	. . . 4 $\/$ $\/$ $\/$ $\/$
6	4, 5	mpbir 146	. . 3 $\/$ $\/$
7		orel2 738	. . 3 $\/$ $\/$ $\/$
8	6, 7	mpi 15	. 2 $\/$
9		ax16 1866	. . 3
10		sp 1564	. . 3
11	9, 10	jaoi 728	. 2 $\/$
12	8, 11	syl 14	1

Colors of variables: wff set class

Syntax hints:

wn 3

wi 4 $\/$ wo 720

wal 1400

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-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587

This theorem depends on definitions: df-bi 117 df-nf 1514 df-sb 1816

This theorem is referenced by: nd5 1871 ax11v2 1873 dveeq1 2079