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| Mirrors > Home > MPE Home > Th. List > connhmph | Structured version Visualization version GIF version | ||
| Description: Connectedness is a topological property. (Contributed by Jeff Hankins, 3-Jul-2009.) |
| Ref | Expression |
|---|---|
| connhmph | ⊢ (𝐽 ≃ 𝐾 → (𝐽 ∈ Conn → 𝐾 ∈ Conn)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | hmph 23914 | . 2 ⊢ (𝐽 ≃ 𝐾 ↔ (𝐽Homeo𝐾) ≠ ∅) | |
| 2 | n0 4308 | . . 3 ⊢ ((𝐽Homeo𝐾) ≠ ∅ ↔ ∃𝑓 𝑓 ∈ (𝐽Homeo𝐾)) | |
| 3 | eqid 2763 | . . . . . . 7 ⊢ ∪ 𝐽 = ∪ 𝐽 | |
| 4 | eqid 2763 | . . . . . . 7 ⊢ ∪ 𝐾 = ∪ 𝐾 | |
| 5 | 3, 4 | hmeof1o 23902 | . . . . . 6 ⊢ (𝑓 ∈ (𝐽Homeo𝐾) → 𝑓:∪ 𝐽–1-1-onto→∪ 𝐾) |
| 6 | f1ofo 6830 | . . . . . 6 ⊢ (𝑓:∪ 𝐽–1-1-onto→∪ 𝐾 → 𝑓:∪ 𝐽–onto→∪ 𝐾) | |
| 7 | 5, 6 | syl 18 | . . . . 5 ⊢ (𝑓 ∈ (𝐽Homeo𝐾) → 𝑓:∪ 𝐽–onto→∪ 𝐾) |
| 8 | hmeocn 23898 | . . . . 5 ⊢ (𝑓 ∈ (𝐽Homeo𝐾) → 𝑓 ∈ (𝐽 Cn 𝐾)) | |
| 9 | 4 | cnconn 23560 | . . . . . . 7 ⊢ ((𝐽 ∈ Conn ∧ 𝑓:∪ 𝐽–onto→∪ 𝐾 ∧ 𝑓 ∈ (𝐽 Cn 𝐾)) → 𝐾 ∈ Conn) |
| 10 | 9 | 3expb 1138 | . . . . . 6 ⊢ ((𝐽 ∈ Conn ∧ (𝑓:∪ 𝐽–onto→∪ 𝐾 ∧ 𝑓 ∈ (𝐽 Cn 𝐾))) → 𝐾 ∈ Conn) |
| 11 | 10 | expcom 418 | . . . . 5 ⊢ ((𝑓:∪ 𝐽–onto→∪ 𝐾 ∧ 𝑓 ∈ (𝐽 Cn 𝐾)) → (𝐽 ∈ Conn → 𝐾 ∈ Conn)) |
| 12 | 7, 8, 11 | syl2anc 595 | . . . 4 ⊢ (𝑓 ∈ (𝐽Homeo𝐾) → (𝐽 ∈ Conn → 𝐾 ∈ Conn)) |
| 13 | 12 | exlimiv 1960 | . . 3 ⊢ (∃𝑓 𝑓 ∈ (𝐽Homeo𝐾) → (𝐽 ∈ Conn → 𝐾 ∈ Conn)) |
| 14 | 2, 13 | sylbi 220 | . 2 ⊢ ((𝐽Homeo𝐾) ≠ ∅ → (𝐽 ∈ Conn → 𝐾 ∈ Conn)) |
| 15 | 1, 14 | sylbi 220 | 1 ⊢ (𝐽 ≃ 𝐾 → (𝐽 ∈ Conn → 𝐾 ∈ Conn)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 400 ∃wex 1809 ∈ wcel 2143 ≠ wne 2958 ∅c0 4287 ∪ cuni 4873 class class class wbr 5110 –onto→wfo 6536 –1-1-onto→wf1o 6537 (class class class)co 7412 Cn ccn 23362 Conncconn 23549 Homeochmeo 23891 ≃ chmph 23892 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-sep 5258 ax-nul 5270 ax-pow 5338 ax-pr 5406 ax-un 7734 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-ral 3080 df-rex 3090 df-rab 3417 df-v 3457 df-sbc 3746 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4288 df-if 4489 df-pw 4565 df-sn 4591 df-pr 4593 df-op 4597 df-uni 4874 df-iun 4959 df-br 5111 df-opab 5175 df-mpt 5194 df-id 5558 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-ov 7415 df-oprab 7416 df-mpo 7417 df-1st 7987 df-2nd 7988 df-1o 8454 df-map 8827 df-top 23032 df-topon 23049 df-cld 23157 df-cn 23365 df-conn 23550 df-hmeo 23893 df-hmph 23894 |
| This theorem is referenced by: xrconn 25089 |
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