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| Mirrors > Home > ILE Home > Th. List > fimacnvdisj | GIF version | ||
| Description: The preimage of a class disjoint with a mapping's codomain is empty. (Contributed by FL, 24-Jan-2007.) |
| Ref | Expression |
|---|---|
| fimacnvdisj | ⊢ ((𝐹:𝐴⟶𝐵 ∧ (𝐵 ∩ 𝐶) = ∅) → (◡𝐹 “ 𝐶) = ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-rn 4729 | . . . 4 ⊢ ran 𝐹 = dom ◡𝐹 | |
| 2 | frn 5481 | . . . . 5 ⊢ (𝐹:𝐴⟶𝐵 → ran 𝐹 ⊆ 𝐵) | |
| 3 | 2 | adantr 276 | . . . 4 ⊢ ((𝐹:𝐴⟶𝐵 ∧ (𝐵 ∩ 𝐶) = ∅) → ran 𝐹 ⊆ 𝐵) |
| 4 | 1, 3 | eqsstrrid 3271 | . . 3 ⊢ ((𝐹:𝐴⟶𝐵 ∧ (𝐵 ∩ 𝐶) = ∅) → dom ◡𝐹 ⊆ 𝐵) |
| 5 | ssdisj 3548 | . . 3 ⊢ ((dom ◡𝐹 ⊆ 𝐵 ∧ (𝐵 ∩ 𝐶) = ∅) → (dom ◡𝐹 ∩ 𝐶) = ∅) | |
| 6 | 4, 5 | sylancom 420 | . 2 ⊢ ((𝐹:𝐴⟶𝐵 ∧ (𝐵 ∩ 𝐶) = ∅) → (dom ◡𝐹 ∩ 𝐶) = ∅) |
| 7 | imadisj 5089 | . 2 ⊢ ((◡𝐹 “ 𝐶) = ∅ ↔ (dom ◡𝐹 ∩ 𝐶) = ∅) | |
| 8 | 6, 7 | sylibr 134 | 1 ⊢ ((𝐹:𝐴⟶𝐵 ∧ (𝐵 ∩ 𝐶) = ∅) → (◡𝐹 “ 𝐶) = ∅) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 = wceq 1395 ∩ cin 3196 ⊆ wss 3197 ∅c0 3491 ◡ccnv 4717 dom cdm 4718 ran crn 4719 “ cima 4721 ⟶wf 5313 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-14 2203 ax-ext 2211 ax-sep 4201 ax-pow 4257 ax-pr 4292 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ral 2513 df-rex 2514 df-v 2801 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-nul 3492 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-br 4083 df-opab 4145 df-xp 4724 df-cnv 4726 df-dm 4728 df-rn 4729 df-res 4730 df-ima 4731 df-f 5321 |
| This theorem is referenced by: (None) |
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