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Mirrors > Home > ILE Home > Th. List > fvimacnv | Unicode version |
Description: The argument of a function value belongs to the preimage of any class containing the function value. Raph Levien remarks: "This proof is unsatisfying, because it seems to me that funimass2 5201 could probably be strengthened to a biconditional." (Contributed by Raph Levien, 20-Nov-2006.) |
Ref | Expression |
---|---|
fvimacnv |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | funfvop 5532 | . . . . 5 | |
2 | funfvex 5438 | . . . . . 6 | |
3 | opelcnvg 4719 | . . . . . 6 | |
4 | 2, 3 | sylancom 416 | . . . . 5 |
5 | 1, 4 | mpbird 166 | . . . 4 |
6 | elimasng 4907 | . . . . 5 | |
7 | 2, 6 | sylancom 416 | . . . 4 |
8 | 5, 7 | mpbird 166 | . . 3 |
9 | snssg 3656 | . . . . . . . 8 | |
10 | 2, 9 | syl 14 | . . . . . . 7 |
11 | imass2 4915 | . . . . . . 7 | |
12 | 10, 11 | syl6bi 162 | . . . . . 6 |
13 | 12 | imp 123 | . . . . 5 |
14 | 13 | sseld 3096 | . . . 4 |
15 | 14 | ex 114 | . . 3 |
16 | 8, 15 | mpid 42 | . 2 |
17 | fvimacnvi 5534 | . . . 4 | |
18 | 17 | ex 114 | . . 3 |
19 | 18 | adantr 274 | . 2 |
20 | 16, 19 | impbid 128 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wb 104 wcel 1480 cvv 2686 wss 3071 csn 3527 cop 3530 ccnv 4538 cdm 4539 cima 4542 wfun 5117 cfv 5123 |
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-sbc 2910 df-un 3075 df-in 3077 df-ss 3084 df-pw 3512 df-sn 3533 df-pr 3534 df-op 3536 df-uni 3737 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-iota 5088 df-fun 5125 df-fn 5126 df-fv 5131 |
This theorem is referenced by: funimass3 5536 elpreima 5539 fisumss 11161 |
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