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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 4865 |
. . 3
| |
| 2 | ssrel 4865 |
. . 3
| |
| 3 | 1, 2 | bi2anan9 614 |
. 2
|
| 4 | eqss 3263 |
. 2
| |
| 5 | 2albiim 1541 |
. 2
| |
| 6 | 3, 4, 5 | 3bitr4g 223 |
1
|
| Colors of variables: wff set class |
| This proof depends on syntax axioms:
|
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4251 ax-pow 4313 ax-pr 4348 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-opab 4194 df-xp 4782 df-rel 4783 |
| This theorem is used by: eqrelriv 4870 eqrelrdv 4873 eqbrrdv 4874 eqrelrdv2 4876 opabid2 4913 reldm0 5001 iss 5112 asymref 5176 funssres 5423 fsn 5883 |
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