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| Mirrors > Home > ILE Home > Th. List > 1ex | Unicode version | ||
| Description: 1 is a set. Common special case. (Contributed by David A. Wheeler, 7-Jul-2016.) |
| Ref | Expression |
|---|---|
| 1ex |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ax-1cn 8278 |
. 2
| |
| 2 | 1 | elexi 2834 |
1
|
| Colors of variables: wff set class |
| This proof depends on syntax axioms:
|
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-5 1500 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-ext 2220 ax-1cn 8278 |
| This proof depends on definitions: df-bi 117 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-v 2823 |
| This theorem is used by: nn1suc 9332 nn0ind-raph 9774 fzprval 10506 fztpval 10507 m1expcl2 11019 1exp 11026 facnn 11187 fac0 11188 prhash2ex 11272 prodf1f 12335 fprodntrivap 12376 prod1dc 12378 fprodssdc 12382 ege2le3 12463 1nprm 12917 pcmpt 13151 ballotfilem2 13286 dvexp 15937 dvef 15953 prmorcht 16282 ppiublem2 16292 bposlem5 16315 lgsdir2lem3 16354 2wlklem 16822 konigsberglem4 16937 konigsberglem5 16938 2o01f 17229 iswomni0 17308 |
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