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Mirrors > Home > MPE Home > Th. List > cntop2 | Structured version Visualization version GIF version |
Description: Reverse closure for a continuous function. (Contributed by Mario Carneiro, 21-Aug-2015.) |
Ref | Expression |
---|---|
cntop2 | ⊢ (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐾 ∈ Top) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2823 | . . . 4 ⊢ ∪ 𝐽 = ∪ 𝐽 | |
2 | eqid 2823 | . . . 4 ⊢ ∪ 𝐾 = ∪ 𝐾 | |
3 | 1, 2 | iscn2 21848 | . . 3 ⊢ (𝐹 ∈ (𝐽 Cn 𝐾) ↔ ((𝐽 ∈ Top ∧ 𝐾 ∈ Top) ∧ (𝐹:∪ 𝐽⟶∪ 𝐾 ∧ ∀𝑥 ∈ 𝐾 (◡𝐹 “ 𝑥) ∈ 𝐽))) |
4 | 3 | simplbi 500 | . 2 ⊢ (𝐹 ∈ (𝐽 Cn 𝐾) → (𝐽 ∈ Top ∧ 𝐾 ∈ Top)) |
5 | 4 | simprd 498 | 1 ⊢ (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐾 ∈ Top) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 ∈ wcel 2114 ∀wral 3140 ∪ cuni 4840 ◡ccnv 5556 “ cima 5560 ⟶wf 6353 (class class class)co 7158 Topctop 21503 Cn ccn 21834 |
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 2795 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 |
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 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ral 3145 df-rex 3146 df-rab 3149 df-v 3498 df-sbc 3775 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-op 4576 df-uni 4841 df-br 5069 df-opab 5131 df-mpt 5149 df-id 5462 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-fv 6365 df-ov 7161 df-oprab 7162 df-mpo 7163 df-map 8410 df-top 21504 df-topon 21521 df-cn 21837 |
This theorem is referenced by: cnco 21876 cncls2i 21880 cnntri 21881 cnss1 21886 cncnpi 21888 cncnp2 21891 cnrest 21895 cnrest2r 21897 paste 21904 cncmp 22002 rncmp 22006 cnconn 22032 connima 22035 conncn 22036 2ndcomap 22068 kgen2cn 22169 txcnmpt 22234 uptx 22235 lmcn2 22259 xkoco1cn 22267 xkoco2cn 22268 xkococnlem 22269 cnmpt11 22273 cnmpt11f 22274 cnmpt1t 22275 cnmpt12 22277 cnmpt21 22281 cnmpt2t 22283 cnmpt22 22284 cnmpt22f 22285 cnmptcom 22288 cnmpt2k 22298 qtopeu 22326 hmeofval 22368 hmeof1o 22374 hmeontr 22379 hmeores 22381 hmeoqtop 22385 hmphen 22395 reghmph 22403 nrmhmph 22404 txhmeo 22413 xpstopnlem1 22419 flfcntr 22653 cnmpopc 23534 ishtpy 23578 htpyco1 23584 htpyco2 23585 isphtpy 23587 phtpyco2 23596 isphtpc 23600 pcofval 23616 pcopt 23628 pcopt2 23629 pcorevlem 23632 pi1cof 23665 pi1coghm 23667 cnmbfm 31523 cnpconn 32479 |
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