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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 3399 |
. . . 4
| |
| 2 | 1 | eqeq1i 2239 |
. . 3
|
| 3 | disj2 3550 |
. . 3
| |
| 4 | reli 4859 |
. . . 4
| |
| 5 | ssrel 4814 |
. . . 4
| |
| 6 | 4, 5 | ax-mp 5 |
. . 3
|
| 7 | 2, 3, 6 | 3bitri 206 |
. 2
|
| 8 | equcom 1754 |
. . . . 5
| |
| 9 | vex 2805 |
. . . . . 6
| |
| 10 | 9 | ideq 4882 |
. . . . 5
|
| 11 | df-br 4089 |
. . . . 5
| |
| 12 | 8, 10, 11 | 3bitr2i 208 |
. . . 4
|
| 13 | vex 2805 |
. . . . . . . 8
| |
| 14 | 13, 9 | opex 4321 |
. . . . . . 7
|
| 15 | 14 | biantrur 303 |
. . . . . 6
|
| 16 | eldif 3209 |
. . . . . 6
| |
| 17 | 15, 16 | bitr4i 187 |
. . . . 5
|
| 18 | df-br 4089 |
. . . . 5
| |
| 19 | 17, 18 | xchnxbir 687 |
. . . 4
|
| 20 | 12, 19 | imbi12i 239 |
. . 3
|
| 21 | 20 | 2albii 1519 |
. 2
|
| 22 | nfv 1576 |
. . . 4
| |
| 23 | breq2 4092 |
. . . . 5
| |
| 24 | 23 | notbid 673 |
. . . 4
|
| 25 | 22, 24 | equsal 1775 |
. . 3
|
| 26 | 25 | albii 1518 |
. 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 619 ax-in2 620 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-pow 4264 ax-pr 4299 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-nf 1509 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ral 2515 df-rex 2516 df-v 2804 df-dif 3202 df-un 3204 df-in 3206 df-ss 3213 df-nul 3495 df-pw 3654 df-sn 3675 df-pr 3676 df-op 3678 df-br 4089 df-opab 4151 df-id 4390 df-xp 4731 df-rel 4732 |
| This theorem is referenced by: (None) |
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