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| Description: A converse is a relation. Theorem 12 of [Suppes] p. 62. |
| Ref | Expression |
|---|---|
| relcnv |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | relopab 3256 |
. 2
| |
| 2 | df-cnv 3176 |
. . 3
| |
| 3 | 2 | releqi 3234 |
. 2
|
| 4 | 1, 3 | mpbir 190 |
1
|
| Colors of variables: wff set class |
| Syntax hints: class class
class wbr 2609 |
| This theorem is referenced by: intasym 3422 asymref 3423 asymrefOLD 3425 cnvopab 3431 cnv0 3432 cnvi 3433 cnvsn 3435 cnvun 3441 cnvin 3442 cnvxp 3450 dfrel2 3471 cnvcnv 3472 resdm2 3482 coi2 3497 cnvexg 3505 funi 3531 funcnv2 3542 fcnvres 3633 f11 3649 f1cnv 3651 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 959 ax-gen 960 ax-8 961 ax-10 963 ax-11 964 ax-12 965 ax-13 966 ax-14 967 ax-17 968 ax-4 970 ax-5o 972 ax-6o 975 ax-9o 1119 ax-10o 1136 ax-16 1206 ax-11o 1213 ax-ext 1452 ax-sep 2693 ax-pow 2732 ax-pr 2769 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 978 df-sb 1168 df-eu 1375 df-mo 1376 df-clab 1457 df-cleq 1462 df-clel 1465 df-ne 1579 df-v 1803 df-dif 2039 df-un 2040 df-in 2041 df-ss 2043 df-nul 2271 df-pw 2392 df-sn 2402 df-pr 2403 df-op 2406 df-opab 2657 df-xp 3174 df-rel 3175 df-cnv 3176 |