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Mirrors > Home > ILE Home > Th. List > funfvima | GIF version |
Description: A function's value in a preimage belongs to the image. (Contributed by NM, 23-Sep-2003.) |
Ref | Expression |
---|---|
funfvima | ⊢ ((Fun 𝐹 ∧ 𝐵 ∈ dom 𝐹) → (𝐵 ∈ 𝐴 → (𝐹‘𝐵) ∈ (𝐹 “ 𝐴))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dmres 4840 | . . . . . . 7 ⊢ dom (𝐹 ↾ 𝐴) = (𝐴 ∩ dom 𝐹) | |
2 | 1 | elin2 3264 | . . . . . 6 ⊢ (𝐵 ∈ dom (𝐹 ↾ 𝐴) ↔ (𝐵 ∈ 𝐴 ∧ 𝐵 ∈ dom 𝐹)) |
3 | funres 5164 | . . . . . . . . 9 ⊢ (Fun 𝐹 → Fun (𝐹 ↾ 𝐴)) | |
4 | fvelrn 5551 | . . . . . . . . 9 ⊢ ((Fun (𝐹 ↾ 𝐴) ∧ 𝐵 ∈ dom (𝐹 ↾ 𝐴)) → ((𝐹 ↾ 𝐴)‘𝐵) ∈ ran (𝐹 ↾ 𝐴)) | |
5 | 3, 4 | sylan 281 | . . . . . . . 8 ⊢ ((Fun 𝐹 ∧ 𝐵 ∈ dom (𝐹 ↾ 𝐴)) → ((𝐹 ↾ 𝐴)‘𝐵) ∈ ran (𝐹 ↾ 𝐴)) |
6 | fvres 5445 | . . . . . . . . . 10 ⊢ (𝐵 ∈ 𝐴 → ((𝐹 ↾ 𝐴)‘𝐵) = (𝐹‘𝐵)) | |
7 | 6 | eleq1d 2208 | . . . . . . . . 9 ⊢ (𝐵 ∈ 𝐴 → (((𝐹 ↾ 𝐴)‘𝐵) ∈ ran (𝐹 ↾ 𝐴) ↔ (𝐹‘𝐵) ∈ ran (𝐹 ↾ 𝐴))) |
8 | df-ima 4552 | . . . . . . . . . 10 ⊢ (𝐹 “ 𝐴) = ran (𝐹 ↾ 𝐴) | |
9 | 8 | eleq2i 2206 | . . . . . . . . 9 ⊢ ((𝐹‘𝐵) ∈ (𝐹 “ 𝐴) ↔ (𝐹‘𝐵) ∈ ran (𝐹 ↾ 𝐴)) |
10 | 7, 9 | syl6rbbr 198 | . . . . . . . 8 ⊢ (𝐵 ∈ 𝐴 → ((𝐹‘𝐵) ∈ (𝐹 “ 𝐴) ↔ ((𝐹 ↾ 𝐴)‘𝐵) ∈ ran (𝐹 ↾ 𝐴))) |
11 | 5, 10 | syl5ibrcom 156 | . . . . . . 7 ⊢ ((Fun 𝐹 ∧ 𝐵 ∈ dom (𝐹 ↾ 𝐴)) → (𝐵 ∈ 𝐴 → (𝐹‘𝐵) ∈ (𝐹 “ 𝐴))) |
12 | 11 | ex 114 | . . . . . 6 ⊢ (Fun 𝐹 → (𝐵 ∈ dom (𝐹 ↾ 𝐴) → (𝐵 ∈ 𝐴 → (𝐹‘𝐵) ∈ (𝐹 “ 𝐴)))) |
13 | 2, 12 | syl5bir 152 | . . . . 5 ⊢ (Fun 𝐹 → ((𝐵 ∈ 𝐴 ∧ 𝐵 ∈ dom 𝐹) → (𝐵 ∈ 𝐴 → (𝐹‘𝐵) ∈ (𝐹 “ 𝐴)))) |
14 | 13 | expd 256 | . . . 4 ⊢ (Fun 𝐹 → (𝐵 ∈ 𝐴 → (𝐵 ∈ dom 𝐹 → (𝐵 ∈ 𝐴 → (𝐹‘𝐵) ∈ (𝐹 “ 𝐴))))) |
15 | 14 | com12 30 | . . 3 ⊢ (𝐵 ∈ 𝐴 → (Fun 𝐹 → (𝐵 ∈ dom 𝐹 → (𝐵 ∈ 𝐴 → (𝐹‘𝐵) ∈ (𝐹 “ 𝐴))))) |
16 | 15 | impd 252 | . 2 ⊢ (𝐵 ∈ 𝐴 → ((Fun 𝐹 ∧ 𝐵 ∈ dom 𝐹) → (𝐵 ∈ 𝐴 → (𝐹‘𝐵) ∈ (𝐹 “ 𝐴)))) |
17 | 16 | pm2.43b 52 | 1 ⊢ ((Fun 𝐹 ∧ 𝐵 ∈ dom 𝐹) → (𝐵 ∈ 𝐴 → (𝐹‘𝐵) ∈ (𝐹 “ 𝐴))) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ∈ wcel 1480 dom cdm 4539 ran crn 4540 ↾ cres 4541 “ cima 4542 Fun 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: funfvima2 5650 fiintim 6817 caseinl 6976 caseinr 6977 ctssdccl 6996 suplocexprlemdisj 7528 suplocexprlemub 7531 ennnfonelemex 11927 ctinfomlemom 11940 txcnp 12440 |
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