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| Description: Membership in a converse. Equation 5 of [Suppes] p. 62. |
| Ref | Expression |
|---|---|
| elcnv2 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elcnv 3299 |
. 2
| |
| 2 | df-br 2625 |
. . . 4
| |
| 3 | 2 | anbi2i 482 |
. . 3
|
| 4 | 3 | 2exbii 1054 |
. 2
|
| 5 | 1, 4 | bitr 173 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: cnvuni 3307 |
| 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-br 2625 df-opab 2672 df-cnv 3192 |