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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 1472 | . . . 4 | |
2 | exsimpl 1596 | . . . . 5 | |
3 | vex 2689 | . . . . . 6 | |
4 | vex 2689 | . . . . . 6 | |
5 | 3, 4 | opelco 4711 | . . . . 5 |
6 | breq2 3933 | . . . . . 6 | |
7 | 6 | cbvexv 1890 | . . . . 5 |
8 | 2, 5, 7 | 3imtr4i 200 | . . . 4 |
9 | 1, 8 | exlimi 1573 | . . 3 |
10 | 3 | eldm2 4737 | . . 3 |
11 | 3 | eldm 4736 | . . 3 |
12 | 9, 10, 11 | 3imtr4i 200 | . 2 |
13 | 12 | ssriv 3101 | 1 |
Colors of variables: wff set class |
Syntax hints: wa 103 wex 1468 wcel 1480 wss 3071 cop 3530 class class class wbr 3929 cdm 4539 ccom 4543 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-sep 4046 ax-pow 4098 ax-pr 4131 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-eu 2002 df-mo 2003 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-v 2688 df-un 3075 df-in 3077 df-ss 3084 df-pw 3512 df-sn 3533 df-pr 3534 df-op 3536 df-br 3930 df-opab 3990 df-co 4548 df-dm 4549 |
This theorem is referenced by: rncoss 4809 dmcosseq 4810 cossxp 5061 funco 5163 cofunexg 6009 casefun 6970 djufun 6989 ctssdccl 6996 |
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