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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 4974 | . . . . 5 ⊢ (◡𝐹 “ 𝐶) ⊆ dom 𝐹 | |
2 | 1 | sseli 3143 | . . . 4 ⊢ (𝐵 ∈ (◡𝐹 “ 𝐶) → 𝐵 ∈ dom 𝐹) |
3 | fndm 5297 | . . . . 5 ⊢ (𝐹 Fn 𝐴 → dom 𝐹 = 𝐴) | |
4 | 3 | eleq2d 2240 | . . . 4 ⊢ (𝐹 Fn 𝐴 → (𝐵 ∈ dom 𝐹 ↔ 𝐵 ∈ 𝐴)) |
5 | 2, 4 | syl5ib 153 | . . 3 ⊢ (𝐹 Fn 𝐴 → (𝐵 ∈ (◡𝐹 “ 𝐶) → 𝐵 ∈ 𝐴)) |
6 | fnfun 5295 | . . . . 5 ⊢ (𝐹 Fn 𝐴 → Fun 𝐹) | |
7 | fvimacnvi 5610 | . . . . 5 ⊢ ((Fun 𝐹 ∧ 𝐵 ∈ (◡𝐹 “ 𝐶)) → (𝐹‘𝐵) ∈ 𝐶) | |
8 | 6, 7 | sylan 281 | . . . 4 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ∈ (◡𝐹 “ 𝐶)) → (𝐹‘𝐵) ∈ 𝐶) |
9 | 8 | ex 114 | . . 3 ⊢ (𝐹 Fn 𝐴 → (𝐵 ∈ (◡𝐹 “ 𝐶) → (𝐹‘𝐵) ∈ 𝐶)) |
10 | 5, 9 | jcad 305 | . 2 ⊢ (𝐹 Fn 𝐴 → (𝐵 ∈ (◡𝐹 “ 𝐶) → (𝐵 ∈ 𝐴 ∧ (𝐹‘𝐵) ∈ 𝐶))) |
11 | fvimacnv 5611 | . . . . 5 ⊢ ((Fun 𝐹 ∧ 𝐵 ∈ dom 𝐹) → ((𝐹‘𝐵) ∈ 𝐶 ↔ 𝐵 ∈ (◡𝐹 “ 𝐶))) | |
12 | 11 | funfni 5298 | . . . 4 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ∈ 𝐴) → ((𝐹‘𝐵) ∈ 𝐶 ↔ 𝐵 ∈ (◡𝐹 “ 𝐶))) |
13 | 12 | biimpd 143 | . . 3 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ∈ 𝐴) → ((𝐹‘𝐵) ∈ 𝐶 → 𝐵 ∈ (◡𝐹 “ 𝐶))) |
14 | 13 | expimpd 361 | . 2 ⊢ (𝐹 Fn 𝐴 → ((𝐵 ∈ 𝐴 ∧ (𝐹‘𝐵) ∈ 𝐶) → 𝐵 ∈ (◡𝐹 “ 𝐶))) |
15 | 10, 14 | impbid 128 | 1 ⊢ (𝐹 Fn 𝐴 → (𝐵 ∈ (◡𝐹 “ 𝐶) ↔ (𝐵 ∈ 𝐴 ∧ (𝐹‘𝐵) ∈ 𝐶))) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ↔ wb 104 ∈ wcel 2141 ◡ccnv 4610 dom cdm 4611 “ cima 4614 Fun wfun 5192 Fn wfn 5193 ‘cfv 5198 |
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 704 ax-5 1440 ax-7 1441 ax-gen 1442 ax-ie1 1486 ax-ie2 1487 ax-8 1497 ax-10 1498 ax-11 1499 ax-i12 1500 ax-bndl 1502 ax-4 1503 ax-17 1519 ax-i9 1523 ax-ial 1527 ax-i5r 1528 ax-14 2144 ax-ext 2152 ax-sep 4107 ax-pow 4160 ax-pr 4194 |
This theorem depends on definitions: df-bi 116 df-3an 975 df-tru 1351 df-nf 1454 df-sb 1756 df-eu 2022 df-mo 2023 df-clab 2157 df-cleq 2163 df-clel 2166 df-nfc 2301 df-ral 2453 df-rex 2454 df-v 2732 df-sbc 2956 df-un 3125 df-in 3127 df-ss 3134 df-pw 3568 df-sn 3589 df-pr 3590 df-op 3592 df-uni 3797 df-br 3990 df-opab 4051 df-id 4278 df-xp 4617 df-rel 4618 df-cnv 4619 df-co 4620 df-dm 4621 df-rn 4622 df-res 4623 df-ima 4624 df-iota 5160 df-fun 5200 df-fn 5201 df-fv 5206 |
This theorem is referenced by: fniniseg 5616 fncnvima2 5617 rexsupp 5620 unpreima 5621 respreima 5624 fisumss 11355 fprodssdc 11553 tanvalap 11671 1arith 12319 cncnpi 13022 cncnp 13024 cnpdis 13036 tx1cn 13063 tx2cn 13064 txcnmpt 13067 txdis1cn 13072 xmeterval 13229 cnbl0 13328 cnblcld 13329 |
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