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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 7926 | . 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 3450 ∘ ccom 5659 |
| 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 2732 ax-sep 5251 ax-pow 5330 ax-pr 5398 ax-un 7736 |
| 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 2739 df-cleq 2752 df-clel 2835 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 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 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 |
| This theorem is used by: domtr 9013 enfixsn 9084 wdomtr 9547 cfcoflem 10274 axcc3 10440 axdc4uzlem 14047 hashfacen 14519 cofu1st 17972 cofu2nd 17974 cofucl 17977 fucid 18063 sursubmefmnd 19005 injsubmefmnd 19006 smndex1mgm 19019 gsumzaddlem 20048 cnfldfun 21599 cnfldfunALT 21600 znle 21749 selvval 22336 evls1fval 22544 evls1val 22545 evl1fval 22553 evl1val 22554 xkococnlem 23885 xkococn 23886 efmndtmd 24327 pserulm 26658 imsval 31166 tocycf 33557 eulerpartgbij 34883 derangenlem 35750 subfacp1lem5 35763 poimirlem9 38378 poimirlem15 38384 poimirlem17 38386 poimirlem20 38389 mbfresfi 38415 tendopl2 41650 erngplus2 41677 erngplus2-rN 41685 dvaplusgv 41883 dvhvaddass 41970 dvhlveclem 41981 diblss 42043 diblsmopel 42044 dicvaddcl 42063 dicvscacl 42064 cdlemn7 42076 dihordlem7 42087 dihopelvalcpre 42121 xihopellsmN 42127 dihopellsm 42128 rabren3dioph 43656 fzisoeu 46133 stirlinglem14 46915 fundcmpsurinjpreimafv 48308 grimco 48805 gricushgr 48833 cycldlenngric 48844 uspgrlim 48908 grlictr 48931 fuco22natlem 50271 |
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