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| Mirrors > Home > ILE Home > Th. List > intirr | Unicode version | ||
| Description: Two ways of saying a relation is irreflexive. Definition of irreflexivity in [Schechter] p. 51. (Contributed by NM, 9-Sep-2004.) (Proof shortened by Andrew Salmon, 27-Aug-2011.) |
| Ref | Expression |
|---|---|
| intirr |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | incom 3369 |
. . . 4
| |
| 2 | 1 | eqeq1i 2214 |
. . 3
|
| 3 | disj2 3520 |
. . 3
| |
| 4 | reli 4814 |
. . . 4
| |
| 5 | ssrel 4770 |
. . . 4
| |
| 6 | 4, 5 | ax-mp 5 |
. . 3
|
| 7 | 2, 3, 6 | 3bitri 206 |
. 2
|
| 8 | equcom 1730 |
. . . . 5
| |
| 9 | vex 2776 |
. . . . . 6
| |
| 10 | 9 | ideq 4837 |
. . . . 5
|
| 11 | df-br 4051 |
. . . . 5
| |
| 12 | 8, 10, 11 | 3bitr2i 208 |
. . . 4
|
| 13 | vex 2776 |
. . . . . . . 8
| |
| 14 | 13, 9 | opex 4280 |
. . . . . . 7
|
| 15 | 14 | biantrur 303 |
. . . . . 6
|
| 16 | eldif 3179 |
. . . . . 6
| |
| 17 | 15, 16 | bitr4i 187 |
. . . . 5
|
| 18 | df-br 4051 |
. . . . 5
| |
| 19 | 17, 18 | xchnxbir 683 |
. . . 4
|
| 20 | 12, 19 | imbi12i 239 |
. . 3
|
| 21 | 20 | 2albii 1495 |
. 2
|
| 22 | nfv 1552 |
. . . 4
| |
| 23 | breq2 4054 |
. . . . 5
| |
| 24 | 23 | notbid 669 |
. . . 4
|
| 25 | 22, 24 | equsal 1751 |
. . 3
|
| 26 | 25 | albii 1494 |
. 2
|
| 27 | 7, 21, 26 | 3bitr2i 208 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-14 2180 ax-ext 2188 ax-sep 4169 ax-pow 4225 ax-pr 4260 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ral 2490 df-rex 2491 df-v 2775 df-dif 3172 df-un 3174 df-in 3176 df-ss 3183 df-nul 3465 df-pw 3622 df-sn 3643 df-pr 3644 df-op 3646 df-br 4051 df-opab 4113 df-id 4347 df-xp 4688 df-rel 4689 |
| This theorem is referenced by: (None) |
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