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Mirrors > Home > ILE Home > Th. List > 3ex | Unicode version |
Description: 3 is a set (common case). (Contributed by David A. Wheeler, 8-Dec-2018.) |
Ref | Expression |
---|---|
3ex |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3cn 8932 | . 2 | |
2 | 1 | elexi 2738 | 1 |
Colors of variables: wff set class |
Syntax hints: wcel 2136 cvv 2726 cc 7751 c3 8909 |
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-5 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-11 1494 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-ext 2147 ax-resscn 7845 ax-1re 7847 ax-addrcl 7850 |
This theorem depends on definitions: df-bi 116 df-nf 1449 df-sb 1751 df-clab 2152 df-cleq 2158 df-clel 2161 df-v 2728 df-in 3122 df-ss 3129 df-2 8916 df-3 8917 |
This theorem is referenced by: fztpval 10018 lgsdir2lem3 13571 |
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