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| Mirrors > Home > MPE Home > Th. List > isf34lem2 | Structured version Visualization version GIF version | ||
| Description: Lemma for isfin3-4 10341. (Contributed by Stefan O'Rear, 7-Nov-2014.) |
| Ref | Expression |
|---|---|
| compss.a | ⊢ 𝐹 = (𝑥 ∈ 𝒫 𝐴 ↦ (𝐴 ∖ 𝑥)) |
| Ref | Expression |
|---|---|
| isf34lem2 | ⊢ (𝐴 ∈ 𝑉 → 𝐹:𝒫 𝐴⟶𝒫 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | difss 4101 | . . . 4 ⊢ (𝐴 ∖ 𝑥) ⊆ 𝐴 | |
| 2 | elpw2g 5290 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → ((𝐴 ∖ 𝑥) ∈ 𝒫 𝐴 ↔ (𝐴 ∖ 𝑥) ⊆ 𝐴)) | |
| 3 | 1, 2 | mpbiri 258 | . . 3 ⊢ (𝐴 ∈ 𝑉 → (𝐴 ∖ 𝑥) ∈ 𝒫 𝐴) |
| 4 | 3 | adantr 480 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑥 ∈ 𝒫 𝐴) → (𝐴 ∖ 𝑥) ∈ 𝒫 𝐴) |
| 5 | compss.a | . 2 ⊢ 𝐹 = (𝑥 ∈ 𝒫 𝐴 ↦ (𝐴 ∖ 𝑥)) | |
| 6 | 4, 5 | fmptd 7088 | 1 ⊢ (𝐴 ∈ 𝑉 → 𝐹:𝒫 𝐴⟶𝒫 𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1540 ∈ wcel 2109 ∖ cdif 3913 ⊆ wss 3916 𝒫 cpw 4565 ↦ cmpt 5190 ⟶wf 6509 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2702 ax-sep 5253 ax-nul 5263 ax-pr 5389 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ral 3046 df-rex 3055 df-rab 3409 df-v 3452 df-dif 3919 df-un 3921 df-in 3923 df-ss 3933 df-nul 4299 df-if 4491 df-pw 4567 df-sn 4592 df-pr 4594 df-op 4598 df-br 5110 df-opab 5172 df-mpt 5191 df-id 5535 df-xp 5646 df-rel 5647 df-cnv 5648 df-co 5649 df-dm 5650 df-rn 5651 df-res 5652 df-ima 5653 df-fun 6515 df-fn 6516 df-f 6517 |
| This theorem is referenced by: isf34lem5 10337 isf34lem7 10338 isf34lem6 10339 |
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