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| Mirrors > Home > ILE Home > Th. List > eqrel | Unicode version | ||
| Description: Extensionality principle for relations. Theorem 3.2(ii) of [Monk1] p. 33. (Contributed by NM, 2-Aug-1994.) |
| Ref | Expression |
|---|---|
| eqrel |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ssrel 4806 |
. . 3
| |
| 2 | ssrel 4806 |
. . 3
| |
| 3 | 1, 2 | bi2anan9 608 |
. 2
|
| 4 | eqss 3239 |
. 2
| |
| 5 | 2albiim 1534 |
. 2
| |
| 6 | 3, 4, 5 | 3bitr4g 223 |
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-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-14 2203 ax-ext 2211 ax-sep 4201 ax-pow 4257 ax-pr 4292 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-v 2801 df-un 3201 df-in 3203 df-ss 3210 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-opab 4145 df-xp 4724 df-rel 4725 |
| This theorem is referenced by: eqrelriv 4811 eqrelrdv 4814 eqbrrdv 4815 eqrelrdv2 4817 opabid2 4852 reldm0 4940 iss 5050 asymref 5113 funssres 5359 fsn 5806 |
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