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| 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 4751 | 
. . 3
 | |
| 2 | ssrel 4751 | 
. . 3
 | |
| 3 | 1, 2 | bi2anan9 606 | 
. 2
 | 
| 4 | eqss 3198 | 
. 2
 | |
| 5 | 2albiim 1502 | 
. 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 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-14 2170 ax-ext 2178 ax-sep 4151 ax-pow 4207 ax-pr 4242 | 
| This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1367 df-nf 1475 df-sb 1777 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-v 2765 df-un 3161 df-in 3163 df-ss 3170 df-pw 3607 df-sn 3628 df-pr 3629 df-op 3631 df-opab 4095 df-xp 4669 df-rel 4670 | 
| This theorem is referenced by: eqrelriv 4756 eqrelrdv 4759 eqbrrdv 4760 eqrelrdv2 4762 opabid2 4797 reldm0 4884 iss 4992 asymref 5055 funssres 5300 fsn 5734 | 
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