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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 7942 | . 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 7752 |
| 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 3900 df-un 3902 df-in 3904 df-ss 3915 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 9035 enfixsn 9106 wdomtr 9570 cfcoflem 10351 axcc3 10517 axdc4uzlem 14127 hashfacen 14600 cofu1st 18059 cofu2nd 18061 cofucl 18064 fucid 18150 sursubmefmnd 19093 injsubmefmnd 19094 smndex1mgm 19107 gsumzaddlem 20136 cnfldfun 21693 cnfldfunALT 21694 znle 21843 selvval 22430 evls1fval 22638 evls1val 22639 evl1fval 22647 evl1val 22648 xkococnlem 23979 xkococn 23980 efmndtmd 24421 pserulm 26750 imsval 31288 tocycf 33679 eulerpartgbij 35005 derangenlem 35937 subfacp1lem5 35950 poimirlem9 38549 poimirlem15 38555 poimirlem17 38557 poimirlem20 38560 mbfresfi 38586 tendopl2 41836 erngplus2 41863 erngplus2-rN 41871 dvaplusgv 42069 dvhvaddass 42156 dvhlveclem 42167 diblss 42229 diblsmopel 42230 dicvaddcl 42249 dicvscacl 42250 cdlemn7 42262 dihordlem7 42273 dihopelvalcpre 42307 xihopellsmN 42313 dihopellsm 42314 rabren3dioph 43823 fzisoeu 46317 stirlinglem14 47098 fundcmpsurinjpreimafv 48491 grimco 48988 gricushgr 49016 cycldlenngric 49027 uspgrlim 49091 grlictr 49114 fuco22natlem 50454 |
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