2exeu - Intuitionistic Logic Explorer

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Theorem 2exeu 2118

Description: Double existential uniqueness implies double unique existential quantification. (Contributed by NM, 3-Dec-2001.)

**Assertion**
Ref	Expression
2exeu	$/\$

**Proof of Theorem 2exeu**
Step	Hyp	Ref	Expression
1		excom 1664	. . . . 5
2		hbe1 1495	. . . . . . . 8
3	2	hbmo 2065	. . . . . . 7
4	3	19.41h 1685	. . . . . 6 $/\$ $/\$
5		19.8a 1590	. . . . . . . . 9
6	5	moimi 2091	. . . . . . . 8
7	6	anim2i 342	. . . . . . 7 $/\$ $/\$
8	7	eximi 1600	. . . . . 6 $/\$ $/\$
9	4, 8	sylbir 135	. . . . 5 $/\$ $/\$
10	1, 9	sylanb 284	. . . 4 $/\$ $/\$
11		simpl 109	. . . . . 6 $/\$
12	11	moimi 2091	. . . . 5 $/\$
13	12	adantl 277	. . . 4 $/\$ $/\$
14	10, 13	anim12i 338	. . 3 $/\$ $/\$ $/\$ $/\$ $/\$ $/\$
15	14	ancoms 268	. 2 $/\$ $/\$ $/\$ $/\$ $/\$ $/\$
16		eu5 2073	. . 3 $/\$
17		eu5 2073	. . 3 $/\$
18	16, 17	anbi12i 460	. 2 $/\$ $/\$ $/\$ $/\$
19		eu5 2073	. . 3 $/\$
20		eu5 2073	. . . . 5 $/\$
21	20	exbii 1605	. . . 4 $/\$
22	20	mobii 2063	. . . 4 $/\$
23	21, 22	anbi12i 460	. . 3 $/\$ $/\$ $/\$ $/\$
24	19, 23	bitri 184	. 2 $/\$ $/\$ $/\$
25	15, 18, 24	3imtr4i 201	1 $/\$

Colors of variables: wff set class

Syntax hints:

wi 4 $/\$ wa 104

wex 1492

weu 2026

wmo 2027

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-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535

This theorem depends on definitions: df-bi 117 df-tru 1356 df-nf 1461 df-sb 1763 df-eu 2029 df-mo 2030

This theorem is referenced by: (None)