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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 2144 Vcvv 3450 ∘ ccom 5654 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-ext 2732 ax-sep 5248 ax-pow 5326 ax-pr 5390 ax-un 7752 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-sb 2099 df-clab 2739 df-cleq 2752 df-clel 2835 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-ss 3896 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-br 5103 df-opab 5167 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 |
| This theorem is used by: domtr 9038 enfixsn 9109 wdomtr 9573 cfcoflem 10354 axcc3 10520 axdc4uzlem 14130 hashfacen 14603 cofu1st 18064 cofu2nd 18066 cofucl 18069 fucid 18155 sursubmefmnd 19098 injsubmefmnd 19099 smndex1mgm 19112 gsumzaddlem 20141 cnfldfun 21698 cnfldfunALT 21699 znle 21848 selvval 22435 evls1fval 22643 evls1val 22644 evl1fval 22652 evl1val 22653 xkococnlem 23984 xkococn 23985 efmndtmd 24426 pserulm 26755 imsval 31293 tocycf 33725 eulerpartgbij 35051 derangenlem 36023 subfacp1lem5 36036 poimirlem9 38641 poimirlem15 38647 poimirlem17 38649 poimirlem20 38652 mbfresfi 38678 tendopl2 41928 erngplus2 41955 erngplus2-rN 41963 dvaplusgv 42161 dvhvaddass 42248 dvhlveclem 42259 diblss 42321 diblsmopel 42322 dicvaddcl 42341 dicvscacl 42342 cdlemn7 42354 dihordlem7 42365 dihopelvalcpre 42399 xihopellsmN 42405 dihopellsm 42406 rabren3dioph 43916 fzisoeu 46410 stirlinglem14 47191 fundcmpsurinjpreimafv 48584 grimco 49081 gricushgr 49109 cycldlenngric 49120 uspgrlim 49184 grlictr 49207 fuco22natlem 50561 |
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