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Theorem hmphsym 24094
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 24088 . . 3 (𝐽 ≃ 𝐾 ↔ (𝐽Homeo𝐾) ≠ ∅)
2 n0 4300 . . 3 ((𝐽Homeo𝐾) ≠ ∅ ↔ ∃𝑓 𝑓 ∈ (𝐽Homeo𝐾))
31, 2bitri 278 . 2 (𝐽 ≃ 𝐾 ↔ ∃𝑓 𝑓 ∈ (𝐽Homeo𝐾))
4 hmeocnv 24074 . . . 4 (𝑓 ∈ (𝐽Homeo𝐾) → ◡𝑓 ∈ (𝐾Homeo𝐽))
5 hmphi 24089 . . . 4 (◡𝑓 ∈ (𝐾Homeo𝐽) → 𝐾 ≃ 𝐽)
64, 5syl 18 . . 3 (𝑓 ∈ (𝐽Homeo𝐾) → 𝐾 ≃ 𝐽)
76exlimiv 1963 . 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 1812   ∈ wcel 2145   ≠ wne 2956  ∅c0 4279   class class class wbr 5103  ◡ccnv 5650  (class class class)co 7418  Homeochmeo 24065   ≃ chmph 24066
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 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733  ax-sep 5249  ax-nul 5260  ax-pow 5327  ax-pr 5391  ax-un 7749
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 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-sbc 3740  df-csb 3848  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-iun 4953  df-br 5104  df-opab 5168  df-mpt 5187  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-suc 6367  df-iota 6493  df-fun 6539  df-fn 6540  df-f 6541  df-fv 6545  df-ov 7421  df-oprab 7422  df-mpo 7423  df-1st 7999  df-2nd 8000  df-1o 8469  df-map 8842  df-top 23205  df-topon 23222  df-cn 23538  df-hmeo 24067  df-hmph 24068
This theorem is used by:  hmpher  24096  hmphsymb  24098  haushmphlem  24099  t0kq  24130  kqhmph  24131  ist1-5lem  24132  reheibor  38753
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