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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 23751 | . 2 ⊢ (𝐽 ≃ 𝐾 ↔ (𝐽Homeo𝐾) ≠ ∅) | |
| 2 | n0 4294 | . . 3 ⊢ ((𝐽Homeo𝐾) ≠ ∅ ↔ ∃𝑓 𝑓 ∈ (𝐽Homeo𝐾)) | |
| 3 | eqid 2737 | . . . . . . 7 ⊢ ∪ 𝐽 = ∪ 𝐽 | |
| 4 | eqid 2737 | . . . . . . 7 ⊢ ∪ 𝐾 = ∪ 𝐾 | |
| 5 | 3, 4 | hmeof1o 23739 | . . . . . 6 ⊢ (𝑓 ∈ (𝐽Homeo𝐾) → 𝑓:∪ 𝐽–1-1-onto→∪ 𝐾) |
| 6 | f1ofo 6781 | . . . . . 6 ⊢ (𝑓:∪ 𝐽–1-1-onto→∪ 𝐾 → 𝑓:∪ 𝐽–onto→∪ 𝐾) | |
| 7 | 5, 6 | syl 17 | . . . . 5 ⊢ (𝑓 ∈ (𝐽Homeo𝐾) → 𝑓:∪ 𝐽–onto→∪ 𝐾) |
| 8 | hmeocn 23735 | . . . . 5 ⊢ (𝑓 ∈ (𝐽Homeo𝐾) → 𝑓 ∈ (𝐽 Cn 𝐾)) | |
| 9 | 4 | cnconn 23397 | . . . . . . 7 ⊢ ((𝐽 ∈ Conn ∧ 𝑓:∪ 𝐽–onto→∪ 𝐾 ∧ 𝑓 ∈ (𝐽 Cn 𝐾)) → 𝐾 ∈ Conn) |
| 10 | 9 | 3expb 1121 | . . . . . 6 ⊢ ((𝐽 ∈ Conn ∧ (𝑓:∪ 𝐽–onto→∪ 𝐾 ∧ 𝑓 ∈ (𝐽 Cn 𝐾))) → 𝐾 ∈ Conn) |
| 11 | 10 | expcom 413 | . . . . 5 ⊢ ((𝑓:∪ 𝐽–onto→∪ 𝐾 ∧ 𝑓 ∈ (𝐽 Cn 𝐾)) → (𝐽 ∈ Conn → 𝐾 ∈ Conn)) |
| 12 | 7, 8, 11 | syl2anc 585 | . . . 4 ⊢ (𝑓 ∈ (𝐽Homeo𝐾) → (𝐽 ∈ Conn → 𝐾 ∈ Conn)) |
| 13 | 12 | exlimiv 1932 | . . 3 ⊢ (∃𝑓 𝑓 ∈ (𝐽Homeo𝐾) → (𝐽 ∈ Conn → 𝐾 ∈ Conn)) |
| 14 | 2, 13 | sylbi 217 | . 2 ⊢ ((𝐽Homeo𝐾) ≠ ∅ → (𝐽 ∈ Conn → 𝐾 ∈ Conn)) |
| 15 | 1, 14 | sylbi 217 | 1 ⊢ (𝐽 ≃ 𝐾 → (𝐽 ∈ Conn → 𝐾 ∈ Conn)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∃wex 1781 ∈ wcel 2114 ≠ wne 2933 ∅c0 4274 ∪ cuni 4851 class class class wbr 5086 –onto→wfo 6490 –1-1-onto→wf1o 6491 (class class class)co 7360 Cn ccn 23199 Conncconn 23386 Homeochmeo 23728 ≃ chmph 23729 |
| 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 2709 ax-sep 5231 ax-nul 5241 ax-pow 5302 ax-pr 5370 ax-un 7682 |
| 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 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 df-id 5519 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-ov 7363 df-oprab 7364 df-mpo 7365 df-1st 7935 df-2nd 7936 df-1o 8398 df-map 8768 df-top 22869 df-topon 22886 df-cld 22994 df-cn 23202 df-conn 23387 df-hmeo 23730 df-hmph 23731 |
| This theorem is referenced by: xrconn 24926 |
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