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Theorem hmphsym 24107
Description: "Is homeomorphic to" is symmetric. (Contributed by FL, 8-Mar-2007.) (Proof shortened by Mario Carneiro, 30-May-2014.)
Assertion
Ref Expression
hmphsym (𝐽 ≃ 𝐾 → 𝐾 ≃ 𝐽)

Proof of Theorem hmphsym
Dummy variable 𝑓 is distinct from all other variables.
StepHypRef Expression
1 hmph 24101 . . 3 (𝐽 ≃ 𝐾 ↔ (𝐽Homeo𝐾) ≠ ∅)
2 n0 4299 . . 3 ((𝐽Homeo𝐾) ≠ ∅ ↔ ∃𝑓 𝑓 ∈ (𝐽Homeo𝐾))
31, 2bitri 278 . 2 (𝐽 ≃ 𝐾 ↔ ∃𝑓 𝑓 ∈ (𝐽Homeo𝐾))
4 hmeocnv 24087 . . . 4 (𝑓 ∈ (𝐽Homeo𝐾) → ◡𝑓 ∈ (𝐾Homeo𝐽))
5 hmphi 24102 . . . 4 (◡𝑓 ∈ (𝐾Homeo𝐽) → 𝐾 ≃ 𝐽)
64, 5syl 18 . . 3 (𝑓 ∈ (𝐽Homeo𝐾) → 𝐾 ≃ 𝐽)
76exlimiv 1962 . 2 (∃𝑓 𝑓 ∈ (𝐽Homeo𝐾) → 𝐾 ≃ 𝐽)
83, 7sylbi 220 1 (𝐽 ≃ 𝐾 → 𝐾 ≃ 𝐽)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4  ∃wex 1811   ∈ wcel 2144   ≠ wne 2955  ∅c0 4278   class class class wbr 5102  ◡ccnv 5649  (class class class)co 7421  Homeochmeo 24078   ≃ chmph 24079
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 7752
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-csb 3847  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-pw 4558  df-sn 4585  df-pr 4587  df-op 4835  df-uni 4867  df-iun 4952  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-suc 6368  df-iota 6494  df-fun 6541  df-fn 6542  df-f 6543  df-fv 6547  df-ov 7424  df-oprab 7425  df-mpo 7426  df-1st 8002  df-2nd 8003  df-1o 8480  df-map 8853  df-top 23218  df-topon 23235  df-cn 23551  df-hmeo 24080  df-hmph 24081
This theorem is used by:  hmpher  24109  hmphsymb  24111  haushmphlem  24112  t0kq  24143  kqhmph  24144  ist1-5lem  24145  reheibor  38867
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