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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 8272 |
. 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 8272 |
| 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 9325 nn0ind-raph 9767 fzprval 10499 fztpval 10500 m1expcl2 11011 1exp 11018 facnn 11179 fac0 11180 prhash2ex 11264 prodf1f 12326 fprodntrivap 12367 prod1dc 12369 fprodssdc 12373 ege2le3 12454 1nprm 12908 pcmpt 13142 ballotfilem2 13277 dvexp 15861 dvef 15877 ppiublem2 16193 bposlem5 16213 lgsdir2lem3 16247 2wlklem 16715 konigsberglem4 16830 konigsberglem5 16831 2o01f 17122 iswomni0 17199 |
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