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Mirrors > Home > MPE Home > Th. List > isf34lem3 | Structured version Visualization version GIF version |
Description: Lemma for isfin3-4 10001. (Contributed by Stefan O'Rear, 7-Nov-2014.) (Revised by Mario Carneiro, 17-May-2015.) |
Ref | Expression |
---|---|
compss.a | ⊢ 𝐹 = (𝑥 ∈ 𝒫 𝐴 ↦ (𝐴 ∖ 𝑥)) |
Ref | Expression |
---|---|
isf34lem3 | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑋 ⊆ 𝒫 𝐴) → (𝐹 “ (𝐹 “ 𝑋)) = 𝑋) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | compss.a | . . . 4 ⊢ 𝐹 = (𝑥 ∈ 𝒫 𝐴 ↦ (𝐴 ∖ 𝑥)) | |
2 | 1 | compsscnv 9990 | . . 3 ⊢ ◡𝐹 = 𝐹 |
3 | 2 | imaeq1i 5931 | . 2 ⊢ (◡𝐹 “ (𝐹 “ 𝑋)) = (𝐹 “ (𝐹 “ 𝑋)) |
4 | 1 | compssiso 9993 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → 𝐹 Isom [⊊] , ◡ [⊊] (𝒫 𝐴, 𝒫 𝐴)) |
5 | isof1o 7137 | . . . 4 ⊢ (𝐹 Isom [⊊] , ◡ [⊊] (𝒫 𝐴, 𝒫 𝐴) → 𝐹:𝒫 𝐴–1-1-onto→𝒫 𝐴) | |
6 | f1of1 6665 | . . . 4 ⊢ (𝐹:𝒫 𝐴–1-1-onto→𝒫 𝐴 → 𝐹:𝒫 𝐴–1-1→𝒫 𝐴) | |
7 | 4, 5, 6 | 3syl 18 | . . 3 ⊢ (𝐴 ∈ 𝑉 → 𝐹:𝒫 𝐴–1-1→𝒫 𝐴) |
8 | f1imacnv 6682 | . . 3 ⊢ ((𝐹:𝒫 𝐴–1-1→𝒫 𝐴 ∧ 𝑋 ⊆ 𝒫 𝐴) → (◡𝐹 “ (𝐹 “ 𝑋)) = 𝑋) | |
9 | 7, 8 | sylan 583 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑋 ⊆ 𝒫 𝐴) → (◡𝐹 “ (𝐹 “ 𝑋)) = 𝑋) |
10 | 3, 9 | eqtr3id 2792 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑋 ⊆ 𝒫 𝐴) → (𝐹 “ (𝐹 “ 𝑋)) = 𝑋) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 399 = wceq 1543 ∈ wcel 2110 ∖ cdif 3868 ⊆ wss 3871 𝒫 cpw 4518 ↦ cmpt 5140 ◡ccnv 5555 “ cima 5559 –1-1→wf1 6382 –1-1-onto→wf1o 6384 Isom wiso 6386 [⊊] crpss 7515 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2016 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2158 ax-12 2175 ax-ext 2708 ax-sep 5197 ax-nul 5204 ax-pr 5327 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2071 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2886 df-ne 2941 df-ral 3066 df-rex 3067 df-rab 3070 df-v 3415 df-dif 3874 df-un 3876 df-in 3878 df-ss 3888 df-pss 3890 df-nul 4243 df-if 4445 df-pw 4520 df-sn 4547 df-pr 4549 df-op 4553 df-uni 4825 df-br 5059 df-opab 5121 df-mpt 5141 df-id 5460 df-xp 5562 df-rel 5563 df-cnv 5564 df-co 5565 df-dm 5566 df-rn 5567 df-res 5568 df-ima 5569 df-iota 6343 df-fun 6387 df-fn 6388 df-f 6389 df-f1 6390 df-fo 6391 df-f1o 6392 df-fv 6393 df-isom 6394 df-rpss 7516 |
This theorem is referenced by: isf34lem5 9997 isf34lem7 9998 isf34lem6 9999 |
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