Theorem hmphsym 22373

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.

Step	Hyp	Ref	Expression
1		hmph 22367	. . 3 ⊢ (𝐽 ≃ 𝐾 ↔ (𝐽Homeo𝐾) ≠ ∅)
2		n0 4296	. . 3 ⊢ ((𝐽Homeo𝐾) ≠ ∅ ↔ ∃𝑓 𝑓 ∈ (𝐽Homeo𝐾))
3	1, 2	bitri 277	. 2 ⊢ (𝐽 ≃ 𝐾 ↔ ∃𝑓 𝑓 ∈ (𝐽Homeo𝐾))
4		hmeocnv 22353	. . . 4 ⊢ (𝑓 ∈ (𝐽Homeo𝐾) → ◡𝑓 ∈ (𝐾Homeo𝐽))
5		hmphi 22368	. . . 4 ⊢ (◡𝑓 ∈ (𝐾Homeo𝐽) → 𝐾 ≃ 𝐽)
6	4, 5	syl 17	. . 3 ⊢ (𝑓 ∈ (𝐽Homeo𝐾) → 𝐾 ≃ 𝐽)
7	6	exlimiv 1931	. 2 ⊢ (∃𝑓 𝑓 ∈ (𝐽Homeo𝐾) → 𝐾 ≃ 𝐽)
8	3, 7	sylbi 219	1 ⊢ (𝐽 ≃ 𝐾 → 𝐾 ≃ 𝐽)

Syntax hints:   → wi 4  ∃wex 1780   ∈ wcel 2114   ≠ wne 3016  ∅c0 4279   class class class wbr 5052  ^◡ccnv 5540  (class class class)co 7142  Homeochmeo 22344   ≃ chmph 22345

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-sep 5189  ax-nul 5196  ax-pow 5252  ax-pr 5316  ax-un 7447

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3488  df-sbc 3764  df-csb 3872  df-dif 3927  df-un 3929  df-in 3931  df-ss 3940  df-nul 4280  df-if 4454  df-pw 4527  df-sn 4554  df-pr 4556  df-op 4560  df-uni 4825  df-iun 4907  df-br 5053  df-opab 5115  df-mpt 5133  df-id 5446  df-xp 5547  df-rel 5548  df-cnv 5549  df-co 5550  df-dm 5551  df-rn 5552  df-res 5553  df-ima 5554  df-suc 6183  df-iota 6300  df-fun 6343  df-fn 6344  df-f 6345  df-fv 6349  df-ov 7145  df-oprab 7146  df-mpo 7147  df-1st 7675  df-2nd 7676  df-1o 8088  df-map 8394  df-top 21485  df-topon 21502  df-cn 21818  df-hmeo 22346  df-hmph 22347

This theorem is referenced by:  hmpher  22375  hmphsymb  22377  haushmphlem  22378  t0kq  22409  kqhmph  22410  ist1-5lem  22411  reheibor  35149