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Mirrors > Home > ILE Home > Th. List > elpreima | GIF version |
Description: Membership in the preimage of a set under a function. (Contributed by Jeff Madsen, 2-Sep-2009.) |
Ref | Expression |
---|---|
elpreima | ⊢ (𝐹 Fn 𝐴 → (𝐵 ∈ (◡𝐹 “ 𝐶) ↔ (𝐵 ∈ 𝐴 ∧ (𝐹‘𝐵) ∈ 𝐶))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cnvimass 4688 | . . . . 5 ⊢ (◡𝐹 “ 𝐶) ⊆ dom 𝐹 | |
2 | 1 | sseli 2941 | . . . 4 ⊢ (𝐵 ∈ (◡𝐹 “ 𝐶) → 𝐵 ∈ dom 𝐹) |
3 | fndm 4998 | . . . . 5 ⊢ (𝐹 Fn 𝐴 → dom 𝐹 = 𝐴) | |
4 | 3 | eleq2d 2107 | . . . 4 ⊢ (𝐹 Fn 𝐴 → (𝐵 ∈ dom 𝐹 ↔ 𝐵 ∈ 𝐴)) |
5 | 2, 4 | syl5ib 143 | . . 3 ⊢ (𝐹 Fn 𝐴 → (𝐵 ∈ (◡𝐹 “ 𝐶) → 𝐵 ∈ 𝐴)) |
6 | fnfun 4996 | . . . . 5 ⊢ (𝐹 Fn 𝐴 → Fun 𝐹) | |
7 | fvimacnvi 5281 | . . . . 5 ⊢ ((Fun 𝐹 ∧ 𝐵 ∈ (◡𝐹 “ 𝐶)) → (𝐹‘𝐵) ∈ 𝐶) | |
8 | 6, 7 | sylan 267 | . . . 4 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ∈ (◡𝐹 “ 𝐶)) → (𝐹‘𝐵) ∈ 𝐶) |
9 | 8 | ex 108 | . . 3 ⊢ (𝐹 Fn 𝐴 → (𝐵 ∈ (◡𝐹 “ 𝐶) → (𝐹‘𝐵) ∈ 𝐶)) |
10 | 5, 9 | jcad 291 | . 2 ⊢ (𝐹 Fn 𝐴 → (𝐵 ∈ (◡𝐹 “ 𝐶) → (𝐵 ∈ 𝐴 ∧ (𝐹‘𝐵) ∈ 𝐶))) |
11 | fvimacnv 5282 | . . . . 5 ⊢ ((Fun 𝐹 ∧ 𝐵 ∈ dom 𝐹) → ((𝐹‘𝐵) ∈ 𝐶 ↔ 𝐵 ∈ (◡𝐹 “ 𝐶))) | |
12 | 11 | funfni 4999 | . . . 4 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ∈ 𝐴) → ((𝐹‘𝐵) ∈ 𝐶 ↔ 𝐵 ∈ (◡𝐹 “ 𝐶))) |
13 | 12 | biimpd 132 | . . 3 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ∈ 𝐴) → ((𝐹‘𝐵) ∈ 𝐶 → 𝐵 ∈ (◡𝐹 “ 𝐶))) |
14 | 13 | expimpd 345 | . 2 ⊢ (𝐹 Fn 𝐴 → ((𝐵 ∈ 𝐴 ∧ (𝐹‘𝐵) ∈ 𝐶) → 𝐵 ∈ (◡𝐹 “ 𝐶))) |
15 | 10, 14 | impbid 120 | 1 ⊢ (𝐹 Fn 𝐴 → (𝐵 ∈ (◡𝐹 “ 𝐶) ↔ (𝐵 ∈ 𝐴 ∧ (𝐹‘𝐵) ∈ 𝐶))) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 97 ↔ wb 98 ∈ wcel 1393 ◡ccnv 4344 dom cdm 4345 “ cima 4348 Fun wfun 4896 Fn wfn 4897 ‘cfv 4902 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-io 630 ax-5 1336 ax-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-10 1396 ax-11 1397 ax-i12 1398 ax-bndl 1399 ax-4 1400 ax-14 1405 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 ax-sep 3875 ax-pow 3927 ax-pr 3944 |
This theorem depends on definitions: df-bi 110 df-3an 887 df-tru 1246 df-nf 1350 df-sb 1646 df-eu 1903 df-mo 1904 df-clab 2027 df-cleq 2033 df-clel 2036 df-nfc 2167 df-ral 2311 df-rex 2312 df-v 2559 df-sbc 2765 df-un 2922 df-in 2924 df-ss 2931 df-pw 3361 df-sn 3381 df-pr 3382 df-op 3384 df-uni 3581 df-br 3765 df-opab 3819 df-id 4030 df-xp 4351 df-rel 4352 df-cnv 4353 df-co 4354 df-dm 4355 df-rn 4356 df-res 4357 df-ima 4358 df-iota 4867 df-fun 4904 df-fn 4905 df-fv 4910 |
This theorem is referenced by: fniniseg 5287 fncnvima2 5288 rexsupp 5291 unpreima 5292 respreima 5295 |
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