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| Description: The converse of a union is the union of converses. Theorem 16 of [Suppes] p. 62. |
| Ref | Expression |
|---|---|
| cnvun |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | relcnv 3441 |
. 2
| |
| 2 | relun 3267 |
. . 3
| |
| 3 | relcnv 3441 |
. . 3
| |
| 4 | relcnv 3441 |
. . 3
| |
| 5 | 2, 3, 4 | mpbir2an 732 |
. 2
|
| 6 | elun 2176 |
. . . 4
| |
| 7 | visset 1816 |
. . . . . 6
| |
| 8 | visset 1816 |
. . . . . 6
| |
| 9 | 7, 8 | opelcnv 3304 |
. . . . 5
|
| 10 | 7, 8 | opelcnv 3304 |
. . . . 5
|
| 11 | 9, 10 | orbi12i 257 |
. . . 4
|
| 12 | 6, 11 | bitr4 176 |
. . 3
|
| 13 | 7, 8 | opelcnv 3304 |
. . 3
|
| 14 | elun 2176 |
. . 3
| |
| 15 | 12, 13, 14 | 3bitr4 183 |
. 2
|
| 16 | 1, 5, 15 | eqrelriv 3257 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: rnun 3463 f1oun 3712 sbthlem8 4460 |
| 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-xp 3190 df-rel 3191 df-cnv 3192 |