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Mirrors > Home > MPE Home > Th. List > 2reu5lem1 | Structured version Visualization version Unicode version |
Description: Lemma for 2reu5 3416. Note that does not mean "there is exactly one in and exactly one in such that holds;" see comment for 2eu5 2557. (Contributed by Alexander van der Vekens, 17-Jun-2017.) |
Ref | Expression |
---|---|
2reu5lem1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-reu 2919 | . . 3 | |
2 | 1 | reubii 3128 | . 2 |
3 | df-reu 2919 | . . 3 | |
4 | euanv 2534 | . . . . . 6 | |
5 | 4 | bicomi 214 | . . . . 5 |
6 | 3anass 1042 | . . . . . . 7 | |
7 | 6 | bicomi 214 | . . . . . 6 |
8 | 7 | eubii 2492 | . . . . 5 |
9 | 5, 8 | bitri 264 | . . . 4 |
10 | 9 | eubii 2492 | . . 3 |
11 | 3, 10 | bitri 264 | . 2 |
12 | 2, 11 | bitri 264 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wb 196 wa 384 w3a 1037 wcel 1990 weu 2470 wreu 2914 |
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-12 2047 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-eu 2474 df-reu 2919 |
This theorem is referenced by: 2reu5lem3 3415 |
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