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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 3253 |
. . 3
| |
| 2 | ssrel 3253 |
. . 3
| |
| 3 | 1, 2 | bi2anan9 634 |
. 2
|
| 4 | eqss 2080 |
. 2
| |
| 5 | 2albi 1110 |
. 2
| |
| 6 | 3, 4, 5 | 3bitr4g 557 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: eqrelriv 3257 opabid2 3273 reldm0 3337 iss 3403 asymref 3445 intirr 3447 dfrel2 3491 cores 3505 coi1 3516 funssres 3558 fn0 3611 fcoi1 3651 fcoi2 3652 fcnvres 3654 fnopabfv 3764 eqfnfv 3803 fsn 3840 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 964 ax-gen 965 ax-8 966 ax-10 968 ax-11 969 ax-12 970 ax-13 971 ax-14 972 ax-17 973 ax-4 975 ax-5o 977 ax-6o 980 ax-9o 1125 ax-10o 1142 ax-16 1212 ax-11o 1220 ax-ext 1462 ax-sep 2708 ax-pow 2748 ax-pr 2785 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 983 df-sb 1174 df-eu 1384 df-mo 1385 df-clab 1467 df-cleq 1472 df-clel 1475 df-ne 1590 df-v 1815 df-dif 2052 df-un 2053 df-in 2054 df-ss 2056 df-nul 2284 df-pw 2406 df-sn 2416 df-pr 2417 df-op 2420 df-opab 2672 df-xp 3190 df-rel 3191 |