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Mirrors > Home > ILE Home > Th. List > funco | Unicode version |
Description: The composition of two functions is a function. Exercise 29 of [TakeutiZaring] p. 25. (Contributed by NM, 26-Jan-1997.) (Proof shortened by Andrew Salmon, 17-Sep-2011.) |
Ref | Expression |
---|---|
funco |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dmcoss 4808 | . . . . 5 | |
2 | funmo 5138 | . . . . . . . . . 10 | |
3 | 2 | alrimiv 1846 | . . . . . . . . 9 |
4 | 3 | ralrimivw 2506 | . . . . . . . 8 |
5 | dffun8 5151 | . . . . . . . . 9 | |
6 | 5 | simprbi 273 | . . . . . . . 8 |
7 | 4, 6 | anim12ci 337 | . . . . . . 7 |
8 | r19.26 2558 | . . . . . . 7 | |
9 | 7, 8 | sylibr 133 | . . . . . 6 |
10 | nfv 1508 | . . . . . . . 8 | |
11 | 10 | euexex 2084 | . . . . . . 7 |
12 | 11 | ralimi 2495 | . . . . . 6 |
13 | 9, 12 | syl 14 | . . . . 5 |
14 | ssralv 3161 | . . . . 5 | |
15 | 1, 13, 14 | mpsyl 65 | . . . 4 |
16 | df-br 3930 | . . . . . . 7 | |
17 | df-co 4548 | . . . . . . . 8 | |
18 | 17 | eleq2i 2206 | . . . . . . 7 |
19 | opabid 4179 | . . . . . . 7 | |
20 | 16, 18, 19 | 3bitri 205 | . . . . . 6 |
21 | 20 | mobii 2036 | . . . . 5 |
22 | 21 | ralbii 2441 | . . . 4 |
23 | 15, 22 | sylibr 133 | . . 3 |
24 | relco 5037 | . . 3 | |
25 | 23, 24 | jctil 310 | . 2 |
26 | dffun7 5150 | . 2 | |
27 | 25, 26 | sylibr 133 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wal 1329 wex 1468 wcel 1480 weu 1999 wmo 2000 wral 2416 wss 3071 cop 3530 class class class wbr 3929 copab 3988 cdm 4539 ccom 4543 wrel 4544 wfun 5117 |
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-ral 2421 df-rex 2422 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-id 4215 df-xp 4545 df-rel 4546 df-cnv 4547 df-co 4548 df-dm 4549 df-fun 5125 |
This theorem is referenced by: fnco 5231 f1co 5340 tposfun 6157 casefun 6970 caseinj 6974 caseinl 6976 caseinr 6977 djufun 6989 djuinj 6991 ctssdccl 6996 |
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