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| Description: The membership relation is irreflexive: no set is a member of itself. Theorem 105 of [Suppes] p. 54. (This is trivial to prove from zfregfr 4581 and efrirr 2923, but this proof is direct from the Axiom of Regularity.) |
| Ref | Expression |
|---|---|
| elirrv |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eleq1 1531 |
. . . 4
| |
| 2 | visset 1809 |
. . . . 5
| |
| 3 | 2 | snid 2431 |
. . . 4
|
| 4 | 1, 3 | a4eiv 1272 |
. . 3
|
| 5 | snex 2745 |
. . . 4
| |
| 6 | 5 | zfregcl 4575 |
. . 3
|
| 7 | 4, 6 | ax-mp 7 |
. 2
|
| 8 | ax-14 968 |
. . . . . . . . 9
| |
| 9 | 8 | equcoms 1128 |
. . . . . . . 8
|
| 10 | 9 | com12 11 |
. . . . . . 7
|
| 11 | elsn 2417 |
. . . . . . 7
| |
| 12 | 10, 11 | syl5ib 206 |
. . . . . 6
|
| 13 | eleq1 1531 |
. . . . . . . . 9
| |
| 14 | 13 | negbid 610 |
. . . . . . . 8
|
| 15 | 14 | rcla4cv 1870 |
. . . . . . 7
|
| 16 | 3, 15 | mt2i 110 |
. . . . . 6
|
| 17 | 12, 16 | nsyli 121 |
. . . . 5
|
| 18 | 17 | con2d 91 |
. . . 4
|
| 19 | 18 | r19.21aiv 1710 |
. . 3
|
| 20 | ralnex 1650 |
. . 3
| |
| 21 | 19, 20 | sylib 198 |
. 2
|
| 22 | 7, 21 | mt2 109 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: elirr 4579 aceq6b 4722 nd1 4918 nd2 4919 nd3 4920 axunnd 4928 axregndlem1 4934 axregndlem2 4935 axregnd 4936 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 960 ax-gen 961 ax-8 962 ax-10 964 ax-11 965 ax-12 966 ax-13 967 ax-14 968 ax-17 969 ax-4 971 ax-5o 973 ax-6o 976 ax-9o 1121 ax-10o 1138 ax-16 1208 ax-11o 1216 ax-ext 1457 ax-sep 2698 ax-pow 2737 ax-reg 4573 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 979 df-sb 1170 df-eu 1380 df-mo 1381 df-clab 1462 df-cleq 1467 df-clel 1470 df-ne 1584 df-ral 1646 df-rex 1647 df-v 1808 df-dif 2045 df-un 2046 df-in 2047 df-ss 2049 df-nul 2277 df-pw 2398 df-sn 2408 df-pr 2409 |