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Mirrors > Home > ILE Home > Th. List > funimass2 | Unicode version |
Description: A kind of contraposition law that infers an image subclass from a subclass of a preimage. (Contributed by NM, 25-May-2004.) |
Ref | Expression |
---|---|
funimass2 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | imass2 4915 | . 2 | |
2 | funimacnv 5199 | . . . . 5 | |
3 | 2 | sseq2d 3127 | . . . 4 |
4 | inss1 3296 | . . . . 5 | |
5 | sstr2 3104 | . . . . 5 | |
6 | 4, 5 | mpi 15 | . . . 4 |
7 | 3, 6 | syl6bi 162 | . . 3 |
8 | 7 | imp 123 | . 2 |
9 | 1, 8 | sylan2 284 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 cin 3070 wss 3071 ccnv 4538 crn 4540 cima 4542 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-rn 4550 df-res 4551 df-ima 4552 df-fun 5125 |
This theorem is referenced by: fvimacnvi 5534 |
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