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| Mirrors > Home > MPE Home > Th. List > hmeoco | Structured version Visualization version GIF version | ||
| Description: The composite of two homeomorphisms is a homeomorphism. (Contributed by FL, 9-Mar-2007.) (Proof shortened by Mario Carneiro, 23-Aug-2015.) |
| Ref | Expression |
|---|---|
| hmeoco | ⊢ ((𝐹 ∈ (𝐽Homeo𝐾) ∧ 𝐺 ∈ (𝐾Homeo𝐿)) → (𝐺 ∘ 𝐹) ∈ (𝐽Homeo𝐿)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | hmeocn 23970 | . . 3 ⊢ (𝐹 ∈ (𝐽Homeo𝐾) → 𝐹 ∈ (𝐽 Cn 𝐾)) | |
| 2 | hmeocn 23970 | . . 3 ⊢ (𝐺 ∈ (𝐾Homeo𝐿) → 𝐺 ∈ (𝐾 Cn 𝐿)) | |
| 3 | cnco 23475 | . . 3 ⊢ ((𝐹 ∈ (𝐽 Cn 𝐾) ∧ 𝐺 ∈ (𝐾 Cn 𝐿)) → (𝐺 ∘ 𝐹) ∈ (𝐽 Cn 𝐿)) | |
| 4 | 1, 2, 3 | syl2an 608 | . 2 ⊢ ((𝐹 ∈ (𝐽Homeo𝐾) ∧ 𝐺 ∈ (𝐾Homeo𝐿)) → (𝐺 ∘ 𝐹) ∈ (𝐽 Cn 𝐿)) |
| 5 | cnvco 5877 | . . 3 ⊢ ◡(𝐺 ∘ 𝐹) = (◡𝐹 ∘ ◡𝐺) | |
| 6 | hmeocnvcn 23971 | . . . 4 ⊢ (𝐺 ∈ (𝐾Homeo𝐿) → ◡𝐺 ∈ (𝐿 Cn 𝐾)) | |
| 7 | hmeocnvcn 23971 | . . . 4 ⊢ (𝐹 ∈ (𝐽Homeo𝐾) → ◡𝐹 ∈ (𝐾 Cn 𝐽)) | |
| 8 | cnco 23475 | . . . 4 ⊢ ((◡𝐺 ∈ (𝐿 Cn 𝐾) ∧ ◡𝐹 ∈ (𝐾 Cn 𝐽)) → (◡𝐹 ∘ ◡𝐺) ∈ (𝐿 Cn 𝐽)) | |
| 9 | 6, 7, 8 | syl2anr 609 | . . 3 ⊢ ((𝐹 ∈ (𝐽Homeo𝐾) ∧ 𝐺 ∈ (𝐾Homeo𝐿)) → (◡𝐹 ∘ ◡𝐺) ∈ (𝐿 Cn 𝐽)) |
| 10 | 5, 9 | eqeltrid 2869 | . 2 ⊢ ((𝐹 ∈ (𝐽Homeo𝐾) ∧ 𝐺 ∈ (𝐾Homeo𝐿)) → ◡(𝐺 ∘ 𝐹) ∈ (𝐿 Cn 𝐽)) |
| 11 | ishmeo 23969 | . 2 ⊢ ((𝐺 ∘ 𝐹) ∈ (𝐽Homeo𝐿) ↔ ((𝐺 ∘ 𝐹) ∈ (𝐽 Cn 𝐿) ∧ ◡(𝐺 ∘ 𝐹) ∈ (𝐿 Cn 𝐽))) | |
| 12 | 4, 10, 11 | sylanbrc 595 | 1 ⊢ ((𝐹 ∈ (𝐽Homeo𝐾) ∧ 𝐺 ∈ (𝐾Homeo𝐿)) → (𝐺 ∘ 𝐹) ∈ (𝐽Homeo𝐿)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∈ wcel 2146 ◡ccnv 5662 ∘ ccom 5667 (class class class)co 7419 Cn ccn 23433 Homeochmeo 23963 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-sep 5259 ax-nul 5271 ax-pow 5338 ax-pr 5406 ax-un 7742 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-ral 3082 df-rex 3092 df-rab 3419 df-v 3459 df-sbc 3747 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-br 5112 df-opab 5176 df-mpt 5195 df-id 5558 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-fv 6548 df-ov 7422 df-oprab 7423 df-mpo 7424 df-map 8832 df-top 23103 df-topon 23120 df-cn 23436 df-hmeo 23965 |
| This theorem is used by: hmphtr 23993 xpstopnlem1 24019 tgpconncomp 24323 tsmsxplem1 24363 |
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