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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 24128 | . 2 ⊢ (𝐽 ≃ 𝐾 ↔ (𝐽Homeo𝐾) ≠ ∅) | |
| 2 | n0 4303 | . . 3 ⊢ ((𝐽Homeo𝐾) ≠ ∅ ↔ ∃𝑓 𝑓 ∈ (𝐽Homeo𝐾)) | |
| 3 | eqid 2763 | . . . . . . 7 ⊢ ∪ 𝐽 = ∪ 𝐽 | |
| 4 | eqid 2763 | . . . . . . 7 ⊢ ∪ 𝐾 = ∪ 𝐾 | |
| 5 | 3, 4 | hmeof1o 24116 | . . . . . 6 ⊢ (𝑓 ∈ (𝐽Homeo𝐾) → 𝑓:∪ 𝐽⟶1-1onto∪ 𝐾) |
| 6 | f1ofo 6857 | . . . . . 6 ⊢ (𝑓:∪ 𝐽⟶1-1onto∪ 𝐾 → 𝑓:∪ 𝐽⟶onto∪ 𝐾) | |
| 7 | 5, 6 | syl 18 | . . . . 5 ⊢ (𝑓 ∈ (𝐽Homeo𝐾) → 𝑓:∪ 𝐽⟶onto∪ 𝐾) |
| 8 | hmeocn 24112 | . . . . 5 ⊢ (𝑓 ∈ (𝐽Homeo𝐾) → 𝑓 ∈ (𝐽 Cn 𝐾)) | |
| 9 | 4 | cnconn 23773 | . . . . . . 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 419 | . . . . 5 ⊢ ((𝑓:∪ 𝐽⟶onto∪ 𝐾 ∧ 𝑓 ∈ (𝐽 Cn 𝐾)) → (𝐽 ∈ Conn → 𝐾 ∈ Conn)) |
| 12 | 7, 8, 11 | syl2anc 596 | . . . 4 ⊢ (𝑓 ∈ (𝐽Homeo𝐾) → (𝐽 ∈ Conn → 𝐾 ∈ Conn)) |
| 13 | 12 | exlimiv 1965 | . . 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 |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∃wex 1812 ∈ wcel 2147 ≠ wne 2959 ∅c0 4281 ∪ cuni 4870 class class class wbr 5106 ⟶ontowfo 6559 ⟶1-1ontowf1o 6560 (class class class)co 7446 Cn ccn 23575 Conncconn 23762 Homeochmeo 24105 ≃ chmph 24106 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5253 ax-nul 5264 ax-pow 5332 ax-pr 5396 ax-un 7778 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-ral 3081 df-rex 3091 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-iun 4956 df-br 5107 df-opab 5172 df-mpt 5191 df-id 5551 df-xp 5662 df-rel 5663 df-cnv 5664 df-co 5665 df-dm 5666 df-rn 5667 df-res 5668 df-ima 5669 df-suc 6389 df-iota 6515 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fo 6567 df-f1o 6568 df-fv 6569 df-ov 7449 df-oprab 7450 df-mpo 7451 df-1st 8028 df-2nd 8029 df-1o 8507 df-map 8880 df-top 23245 df-topon 23262 df-cld 23370 df-cn 23578 df-conn 23763 df-hmeo 24107 df-hmph 24108 |
| This theorem is used by: xrconn 25303 |
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