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Mirrors > Home > ILE Home > Th. List > 0er | Unicode version |
Description: The empty set is an equivalence relation on the empty set. (Contributed by Mario Carneiro, 5-Sep-2015.) |
Ref | Expression |
---|---|
0er |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rel0 4664 | . . . 4 | |
2 | 1 | a1i 9 | . . 3 |
3 | df-br 3930 | . . . . 5 | |
4 | noel 3367 | . . . . . 6 | |
5 | 4 | pm2.21i 635 | . . . . 5 |
6 | 3, 5 | sylbi 120 | . . . 4 |
7 | 6 | adantl 275 | . . 3 |
8 | 4 | pm2.21i 635 | . . . . 5 |
9 | 3, 8 | sylbi 120 | . . . 4 |
10 | 9 | ad2antrl 481 | . . 3 |
11 | noel 3367 | . . . . . 6 | |
12 | noel 3367 | . . . . . 6 | |
13 | 11, 12 | 2false 690 | . . . . 5 |
14 | df-br 3930 | . . . . 5 | |
15 | 13, 14 | bitr4i 186 | . . . 4 |
16 | 15 | a1i 9 | . . 3 |
17 | 2, 7, 10, 16 | iserd 6455 | . 2 |
18 | 17 | mptru 1340 | 1 |
Colors of variables: wff set class |
Syntax hints: wb 104 wtru 1332 wcel 1480 c0 3363 cop 3530 class class class wbr 3929 wrel 4544 wer 6426 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-sep 4046 ax-pow 4098 ax-pr 4131 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-eu 2002 df-mo 2003 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ral 2421 df-rex 2422 df-v 2688 df-dif 3073 df-un 3075 df-in 3077 df-ss 3084 df-nul 3364 df-pw 3512 df-sn 3533 df-pr 3534 df-op 3536 df-br 3930 df-opab 3990 df-xp 4545 df-rel 4546 df-cnv 4547 df-co 4548 df-dm 4549 df-er 6429 |
This theorem is referenced by: (None) |
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