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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 3242 |
. . 3
| |
| 2 | ssrel 3242 |
. . 3
| |
| 3 | 1, 2 | bi2anan9 631 |
. 2
|
| 4 | eqss 2073 |
. 2
| |
| 5 | 2albi 1106 |
. 2
| |
| 6 | 3, 4, 5 | 3bitr4g 554 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: eqrelriv 3246 opabid2 3262 reldm0 3326 iss 3389 asymref 3431 intirr 3433 dfrel2 3477 cores 3491 coi1 3502 funssres 3544 fn0 3597 fcoi1 3636 fcoi2 3637 fcnvres 3639 fnopabfv 3749 eqfnfv 3788 fsn 3825 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 960 ax-gen 961 ax-8 962 ax-10 964 ax-11 965 ax-12 966 ax-13 967 ax-14 968 ax-17 969 ax-4 971 ax-5o 973 ax-6o 976 ax-9o 1121 ax-10o 1138 ax-16 1208 ax-11o 1216 ax-ext 1457 ax-sep 2698 ax-pow 2737 ax-pr 2774 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 979 df-sb 1170 df-eu 1380 df-mo 1381 df-clab 1462 df-cleq 1467 df-clel 1470 df-ne 1584 df-v 1808 df-dif 2045 df-un 2046 df-in 2047 df-ss 2049 df-nul 2277 df-pw 2398 df-sn 2408 df-pr 2409 df-op 2412 df-opab 2662 df-xp 3179 df-rel 3180 |