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Theorem hmphsym 23747
Description: "Is homeomorphic to" is symmetric. (Contributed by FL, 8-Mar-2007.) (Proof shortened by Mario Carneiro, 30-May-2014.)
Assertion
Ref Expression
hmphsym (𝐽𝐾𝐾𝐽)

Proof of Theorem hmphsym
Dummy variable 𝑓 is distinct from all other variables.
StepHypRef Expression
1 hmph 23741 . . 3 (𝐽𝐾 ↔ (𝐽Homeo𝐾) ≠ ∅)
2 n0 4293 . . 3 ((𝐽Homeo𝐾) ≠ ∅ ↔ ∃𝑓 𝑓 ∈ (𝐽Homeo𝐾))
31, 2bitri 275 . 2 (𝐽𝐾 ↔ ∃𝑓 𝑓 ∈ (𝐽Homeo𝐾))
4 hmeocnv 23727 . . . 4 (𝑓 ∈ (𝐽Homeo𝐾) → 𝑓 ∈ (𝐾Homeo𝐽))
5 hmphi 23742 . . . 4 (𝑓 ∈ (𝐾Homeo𝐽) → 𝐾𝐽)
64, 5syl 17 . . 3 (𝑓 ∈ (𝐽Homeo𝐾) → 𝐾𝐽)
76exlimiv 1932 . 2 (∃𝑓 𝑓 ∈ (𝐽Homeo𝐾) → 𝐾𝐽)
83, 7sylbi 217 1 (𝐽𝐾𝐾𝐽)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wex 1781  wcel 2114  wne 2932  c0 4273   class class class wbr 5085  ccnv 5630  (class class class)co 7367  Homeochmeo 23718  chmph 23719
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2708  ax-sep 5231  ax-nul 5241  ax-pow 5307  ax-pr 5375  ax-un 7689
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-ral 3052  df-rex 3062  df-rab 3390  df-v 3431  df-sbc 3729  df-csb 3838  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-nul 4274  df-if 4467  df-pw 4543  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4851  df-iun 4935  df-br 5086  df-opab 5148  df-mpt 5167  df-id 5526  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-rn 5642  df-res 5643  df-ima 5644  df-suc 6329  df-iota 6454  df-fun 6500  df-fn 6501  df-f 6502  df-fv 6506  df-ov 7370  df-oprab 7371  df-mpo 7372  df-1st 7942  df-2nd 7943  df-1o 8405  df-map 8775  df-top 22859  df-topon 22876  df-cn 23192  df-hmeo 23720  df-hmph 23721
This theorem is referenced by:  hmpher  23749  hmphsymb  23751  haushmphlem  23752  t0kq  23783  kqhmph  23784  ist1-5lem  23785  reheibor  38160
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