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Mirrors > Home > ILE Home > Th. List > dmcoss | Unicode version |
Description: Domain of a composition. Theorem 21 of [Suppes] p. 63. (Contributed by NM, 19-Mar-1998.) (Proof shortened by Andrew Salmon, 27-Aug-2011.) |
Ref | Expression |
---|---|
dmcoss |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfe1 1385 | . . . 4 | |
2 | exsimpl 1508 | . . . . 5 | |
3 | vex 2560 | . . . . . 6 | |
4 | vex 2560 | . . . . . 6 | |
5 | 3, 4 | opelco 4507 | . . . . 5 |
6 | breq2 3768 | . . . . . 6 | |
7 | 6 | cbvexv 1795 | . . . . 5 |
8 | 2, 5, 7 | 3imtr4i 190 | . . . 4 |
9 | 1, 8 | exlimi 1485 | . . 3 |
10 | 3 | eldm2 4533 | . . 3 |
11 | 3 | eldm 4532 | . . 3 |
12 | 9, 10, 11 | 3imtr4i 190 | . 2 |
13 | 12 | ssriv 2949 | 1 |
Colors of variables: wff set class |
Syntax hints: wa 97 wex 1381 wcel 1393 wss 2917 cop 3378 class class class wbr 3764 cdm 4345 ccom 4349 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-io 630 ax-5 1336 ax-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-10 1396 ax-11 1397 ax-i12 1398 ax-bndl 1399 ax-4 1400 ax-14 1405 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 ax-sep 3875 ax-pow 3927 ax-pr 3944 |
This theorem depends on definitions: df-bi 110 df-3an 887 df-tru 1246 df-nf 1350 df-sb 1646 df-eu 1903 df-mo 1904 df-clab 2027 df-cleq 2033 df-clel 2036 df-nfc 2167 df-v 2559 df-un 2922 df-in 2924 df-ss 2931 df-pw 3361 df-sn 3381 df-pr 3382 df-op 3384 df-br 3765 df-opab 3819 df-co 4354 df-dm 4355 |
This theorem is referenced by: rncoss 4602 dmcosseq 4603 cossxp 4843 funco 4940 cofunexg 5738 |
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