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| Mirrors > Home > MPE Home > Th. List > coex | Structured version Visualization version GIF version | ||
| Description: The composition of two sets is a set. (Contributed by NM, 15-Dec-2003.) |
| Ref | Expression |
|---|---|
| coex.1 | ⊢ 𝐴 ∈ V |
| coex.2 | ⊢ 𝐵 ∈ V |
| Ref | Expression |
|---|---|
| coex | ⊢ (𝐴 ∘ 𝐵) ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | coex.1 | . 2 ⊢ 𝐴 ∈ V | |
| 2 | coex.2 | . 2 ⊢ 𝐵 ∈ V | |
| 3 | coexg 7939 | . 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (𝐴 ∘ 𝐵) ∈ V) | |
| 4 | 1, 2, 3 | mp2an 705 | 1 ⊢ (𝐴 ∘ 𝐵) ∈ V |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2145 Vcvv 3451 ∘ ccom 5655 |
| 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 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2733 ax-sep 5249 ax-pow 5327 ax-pr 5391 ax-un 7749 |
| 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-sb 2100 df-clab 2740 df-cleq 2753 df-clel 2836 df-ral 3078 df-rex 3088 df-rab 3414 df-v 3453 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 |
| This theorem is used by: domtr 9027 enfixsn 9098 wdomtr 9562 cfcoflem 10343 axcc3 10509 axdc4uzlem 14119 hashfacen 14592 cofu1st 18051 cofu2nd 18053 cofucl 18056 fucid 18142 sursubmefmnd 19085 injsubmefmnd 19086 smndex1mgm 19099 gsumzaddlem 20128 cnfldfun 21685 cnfldfunALT 21686 znle 21835 selvval 22422 evls1fval 22630 evls1val 22631 evl1fval 22639 evl1val 22640 xkococnlem 23971 xkococn 23972 efmndtmd 24413 pserulm 26742 imsval 31280 tocycf 33671 eulerpartgbij 34997 derangenlem 35915 subfacp1lem5 35928 poimirlem9 38527 poimirlem15 38533 poimirlem17 38535 poimirlem20 38538 mbfresfi 38564 tendopl2 41814 erngplus2 41841 erngplus2-rN 41849 dvaplusgv 42047 dvhvaddass 42134 dvhlveclem 42145 diblss 42207 diblsmopel 42208 dicvaddcl 42227 dicvscacl 42228 cdlemn7 42240 dihordlem7 42251 dihopelvalcpre 42285 xihopellsmN 42291 dihopellsm 42292 rabren3dioph 43801 fzisoeu 46285 stirlinglem14 47066 fundcmpsurinjpreimafv 48459 grimco 48956 gricushgr 48984 cycldlenngric 48995 uspgrlim 49059 grlictr 49082 fuco22natlem 50422 |
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