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Mirrors > Home > MPE Home > Th. List > 2eu1 | Structured version Visualization version Unicode version |
Description: Double existential uniqueness. This theorem shows a condition under which a "naive" definition matches the correct one. (Contributed by NM, 3-Dec-2001.) (Proof shortened by Wolf Lammen, 11-Nov-2019.) |
Ref | Expression |
---|---|
2eu1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2eu2ex 2546 | . . . . 5 | |
2 | df-mo 2475 | . . . . . . 7 | |
3 | 2 | albii 1747 | . . . . . 6 |
4 | euim 2523 | . . . . . . 7 | |
5 | 4 | ex 450 | . . . . . 6 |
6 | 3, 5 | syl5bi 232 | . . . . 5 |
7 | 1, 6 | syl 17 | . . . 4 |
8 | 7 | pm2.43b 55 | . . 3 |
9 | 2euswap 2548 | . . . 4 | |
10 | 8, 9 | syld 47 | . . 3 |
11 | 8, 10 | jcad 555 | . 2 |
12 | 2exeu 2549 | . 2 | |
13 | 11, 12 | impbid1 215 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wb 196 wa 384 wal 1481 wex 1704 weu 2470 wmo 2471 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-ex 1705 df-nf 1710 df-eu 2474 df-mo 2475 |
This theorem is referenced by: 2eu2 2554 2eu3 2555 2eu5 2557 |
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