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Mirrors > Home > MPE Home > Th. List > hmphsym | Structured version Visualization version GIF version |
Description: "Is homeomorphic to" is symmetric. (Contributed by FL, 8-Mar-2007.) (Proof shortened by Mario Carneiro, 30-May-2014.) |
Ref | Expression |
---|---|
hmphsym | ⊢ (𝐽 ≃ 𝐾 → 𝐾 ≃ 𝐽) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | hmph 23600 | . . 3 ⊢ (𝐽 ≃ 𝐾 ↔ (𝐽Homeo𝐾) ≠ ∅) | |
2 | n0 4346 | . . 3 ⊢ ((𝐽Homeo𝐾) ≠ ∅ ↔ ∃𝑓 𝑓 ∈ (𝐽Homeo𝐾)) | |
3 | 1, 2 | bitri 275 | . 2 ⊢ (𝐽 ≃ 𝐾 ↔ ∃𝑓 𝑓 ∈ (𝐽Homeo𝐾)) |
4 | hmeocnv 23586 | . . . 4 ⊢ (𝑓 ∈ (𝐽Homeo𝐾) → ◡𝑓 ∈ (𝐾Homeo𝐽)) | |
5 | hmphi 23601 | . . . 4 ⊢ (◡𝑓 ∈ (𝐾Homeo𝐽) → 𝐾 ≃ 𝐽) | |
6 | 4, 5 | syl 17 | . . 3 ⊢ (𝑓 ∈ (𝐽Homeo𝐾) → 𝐾 ≃ 𝐽) |
7 | 6 | exlimiv 1932 | . 2 ⊢ (∃𝑓 𝑓 ∈ (𝐽Homeo𝐾) → 𝐾 ≃ 𝐽) |
8 | 3, 7 | sylbi 216 | 1 ⊢ (𝐽 ≃ 𝐾 → 𝐾 ≃ 𝐽) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∃wex 1780 ∈ wcel 2105 ≠ wne 2939 ∅c0 4322 class class class wbr 5148 ◡ccnv 5675 (class class class)co 7412 Homeochmeo 23577 ≃ chmph 23578 |
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 1912 ax-6 1970 ax-7 2010 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2153 ax-12 2170 ax-ext 2702 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7729 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1781 df-nf 1785 df-sb 2067 df-mo 2533 df-eu 2562 df-clab 2709 df-cleq 2723 df-clel 2809 df-nfc 2884 df-ne 2940 df-ral 3061 df-rex 3070 df-rab 3432 df-v 3475 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-id 5574 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-fv 6551 df-ov 7415 df-oprab 7416 df-mpo 7417 df-1st 7979 df-2nd 7980 df-1o 8472 df-map 8828 df-top 22716 df-topon 22733 df-cn 23051 df-hmeo 23579 df-hmph 23580 |
This theorem is referenced by: hmpher 23608 hmphsymb 23610 haushmphlem 23611 t0kq 23642 kqhmph 23643 ist1-5lem 23644 reheibor 37173 |
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