| Metamath Proof Explorer |
< Previous
Next >
Related theorems Unicode version |
| Description: Two ways of saying a relation is irreflexive. Definition of irreflexivity in [Schechter] p. 51. (The proof was shortened by Andrew Salmon, 27-Aug-2011.) |
| Ref | Expression |
|---|---|
| intirr |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | incom 2787 |
. . . 4
| |
| 2 | 1 | eqeq1i 1891 |
. . 3
|
| 3 | disj2 2921 |
. . 3
| |
| 4 | reli 4105 |
. . . 4
| |
| 5 | ssrel 4075 |
. . . 4
| |
| 6 | 4, 5 | ax-mp 7 |
. . 3
|
| 7 | 2, 3, 6 | 3bitri 194 |
. 2
|
| 8 | equcom 1488 |
. . . . 5
| |
| 9 | visset 2295 |
. . . . . 6
| |
| 10 | 9 | ideq 4116 |
. . . . 5
|
| 11 | df-br 3339 |
. . . . 5
| |
| 12 | 8, 10, 11 | 3bitr2i 196 |
. . . 4
|
| 13 | opex 3527 |
. . . . . 6
| |
| 14 | 13 | biantrur 794 |
. . . . 5
|
| 15 | df-br 3339 |
. . . . . 6
| |
| 16 | 15 | notbii 204 |
. . . . 5
|
| 17 | eldif 2609 |
. . . . 5
| |
| 18 | 14, 16, 17 | 3bitr4i 200 |
. . . 4
|
| 19 | 12, 18 | imbi12i 205 |
. . 3
|
| 20 | 19 | 2albii 1347 |
. 2
|
| 21 | ax-17 1317 |
. . . 4
| |
| 22 | breq2 3342 |
. . . . 5
| |
| 23 | 22 | notbid 673 |
. . . 4
|
| 24 | 21, 23 | equsal 1511 |
. . 3
|
| 25 | 24 | albii 1346 |
. 2
|
| 26 | 7, 20, 25 | 3bitr2i 196 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 1304 ax-gen 1305 ax-8 1306 ax-9 1307 ax-10 1308 ax-11 1309 ax-12 1310 ax-14 1312 ax-17 1317 ax-4 1319 ax-5o 1321 ax-6o 1324 ax-9o 1481 ax-10o 1500 ax-16 1580 ax-11o 1588 ax-ext 1865 ax-sep 3438 ax-nul 3445 ax-pow 3481 ax-pr 3524 |
| This theorem depends on definitions: df-bi 164 df-or 241 df-an 242 df-ex 1327 df-sb 1536 df-eu 1775 df-mo 1776 df-clab 1872 df-cleq 1877 df-clel 1880 df-ne 2019 df-ral 2109 df-v 2294 df-dif 2597 df-un 2600 df-in 2603 df-ss 2605 df-nul 2876 df-pw 3035 df-sn 3049 df-pr 3050 df-op 3053 df-br 3339 df-opab 3396 df-id 3586 df-xp 4000 df-rel 4001 |