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| Description: Extensionality principle for relations. Theorem 3.2(ii) of [Monk1] p. 33. |
| Ref | Expression |
|---|---|
| eqrel |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ssrel 3247 |
. . 3
| |
| 2 | ssrel 3247 |
. . 3
| |
| 3 | 1, 2 | bi2anan9 632 |
. 2
|
| 4 | eqss 2077 |
. 2
| |
| 5 | 2albi 1108 |
. 2
| |
| 6 | 3, 4, 5 | 3bitr4g 555 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: eqrelriv 3251 opabid2 3267 reldm0 3331 iss 3397 asymref 3439 intirr 3441 dfrel2 3485 cores 3499 coi1 3510 funssres 3552 fn0 3605 fcoi1 3645 fcoi2 3646 fcnvres 3648 fnopabfv 3758 eqfnfv 3797 fsn 3834 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 962 ax-gen 963 ax-8 964 ax-10 966 ax-11 967 ax-12 968 ax-13 969 ax-14 970 ax-17 971 ax-4 973 ax-5o 975 ax-6o 978 ax-9o 1123 ax-10o 1140 ax-16 1210 ax-11o 1218 ax-ext 1459 ax-sep 2703 ax-pow 2742 ax-pr 2779 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 981 df-sb 1172 df-eu 1382 df-mo 1383 df-clab 1464 df-cleq 1469 df-clel 1472 df-ne 1587 df-v 1812 df-dif 2049 df-un 2050 df-in 2051 df-ss 2053 df-nul 2281 df-pw 2402 df-sn 2412 df-pr 2413 df-op 2416 df-opab 2667 df-xp 3184 df-rel 3185 |