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Theorem hmeoco 24092
Description: The composite of two homeomorphisms is a homeomorphism. (Contributed by FL, 9-Mar-2007.) (Proof shortened by Mario Carneiro, 23-Aug-2015.)
Assertion
Ref Expression
hmeoco ((𝐹 ∈ (𝐽Homeo𝐾) ∧ 𝐺 ∈ (𝐾Homeo𝐿)) → (𝐺 ∘ 𝐹) ∈ (𝐽Homeo𝐿))

Proof of Theorem hmeoco
StepHypRef Expression
1 hmeocn 24080 . . 3 (𝐹 ∈ (𝐽Homeo𝐾) → 𝐹 ∈ (𝐽 Cn 𝐾))
2 hmeocn 24080 . . 3 (𝐺 ∈ (𝐾Homeo𝐿) → 𝐺 ∈ (𝐾 Cn 𝐿))
3 cnco 23585 . . 3 ((𝐹 ∈ (𝐽 Cn 𝐾) ∧ 𝐺 ∈ (𝐾 Cn 𝐿)) → (𝐺 ∘ 𝐹) ∈ (𝐽 Cn 𝐿))
41, 2, 3syl2an 608 . 2 ((𝐹 ∈ (𝐽Homeo𝐾) ∧ 𝐺 ∈ (𝐾Homeo𝐿)) → (𝐺 ∘ 𝐹) ∈ (𝐽 Cn 𝐿))
5 cnvco 5866 . . 3 ◡(𝐺 ∘ 𝐹) = (◡𝐹 ∘ ◡𝐺)
6 hmeocnvcn 24081 . . . 4 (𝐺 ∈ (𝐾Homeo𝐿) → ◡𝐺 ∈ (𝐿 Cn 𝐾))
7 hmeocnvcn 24081 . . . 4 (𝐹 ∈ (𝐽Homeo𝐾) → ◡𝐹 ∈ (𝐾 Cn 𝐽))
8 cnco 23585 . . . 4 ((◡𝐺 ∈ (𝐿 Cn 𝐾) ∧ ◡𝐹 ∈ (𝐾 Cn 𝐽)) → (◡𝐹 ∘ ◡𝐺) ∈ (𝐿 Cn 𝐽))
96, 7, 8syl2anr 609 . . 3 ((𝐹 ∈ (𝐽Homeo𝐾) ∧ 𝐺 ∈ (𝐾Homeo𝐿)) → (◡𝐹 ∘ ◡𝐺) ∈ (𝐿 Cn 𝐽))
105, 9eqeltrid 2864 . 2 ((𝐹 ∈ (𝐽Homeo𝐾) ∧ 𝐺 ∈ (𝐾Homeo𝐿)) → ◡(𝐺 ∘ 𝐹) ∈ (𝐿 Cn 𝐽))
11 ishmeo 24079 . 2 ((𝐺 ∘ 𝐹) ∈ (𝐽Homeo𝐿) ↔ ((𝐺 ∘ 𝐹) ∈ (𝐽 Cn 𝐿) ∧ ◡(𝐺 ∘ 𝐹) ∈ (𝐿 Cn 𝐽)))
124, 10, 11sylanbrc 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 2144  ◡ccnv 5649   ∘ ccom 5654  (class class class)co 7420   Cn ccn 23543  Homeochmeo 24073
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732  ax-sep 5248  ax-nul 5259  ax-pow 5326  ax-pr 5390  ax-un 7751
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-sbc 3739  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-pw 4558  df-sn 4584  df-pr 4586  df-op 4590  df-uni 4867  df-br 5103  df-opab 5167  df-mpt 5186  df-id 5545  df-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-res 5662  df-ima 5663  df-iota 6494  df-fun 6540  df-fn 6541  df-f 6542  df-fv 6546  df-ov 7423  df-oprab 7424  df-mpo 7425  df-map 8850  df-top 23213  df-topon 23230  df-cn 23546  df-hmeo 24075
This theorem is used by:  hmphtr  24103  xpstopnlem1  24129  tgpconncomp  24433  tsmsxplem1  24473
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