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| Mirrors > Home > MPE Home > Th. List > coexg | Structured version Visualization version GIF version | ||
| Description: The composition of two sets is a set. (Contributed by NM, 19-Mar-1998.) |
| Ref | Expression |
|---|---|
| coexg | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∘ 𝐵) ∈ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cossxp 6230 | . 2 ⊢ (𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) | |
| 2 | dmexg 7843 | . . 3 ⊢ (𝐵 ∈ 𝑊 → dom 𝐵 ∈ V) | |
| 3 | rnexg 7844 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ran 𝐴 ∈ V) | |
| 4 | xpexg 7695 | . . 3 ⊢ ((dom 𝐵 ∈ V ∧ ran 𝐴 ∈ V) → (dom 𝐵 × ran 𝐴) ∈ V) | |
| 5 | 2, 3, 4 | syl2anr 597 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (dom 𝐵 × ran 𝐴) ∈ V) |
| 6 | ssexg 5268 | . 2 ⊢ (((𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) ∧ (dom 𝐵 × ran 𝐴) ∈ V) → (𝐴 ∘ 𝐵) ∈ V) | |
| 7 | 1, 5, 6 | sylancr 587 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∘ 𝐵) ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2113 Vcvv 3440 ⊆ wss 3901 × cxp 5622 dom cdm 5624 ran crn 5625 ∘ ccom 5628 |
| 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 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-ext 2708 ax-sep 5241 ax-nul 5251 ax-pow 5310 ax-pr 5377 ax-un 7680 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-clab 2715 df-cleq 2728 df-clel 2811 df-ral 3052 df-rex 3061 df-rab 3400 df-v 3442 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-br 5099 df-opab 5161 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 |
| This theorem is referenced by: coex 7872 coexd 7873 suppco 8148 fsuppco2 9306 fsuppcor 9307 mapfienlem2 9309 wemapwe 9606 cofsmo 10179 relexpsucnnr 14948 supcvg 15779 imasle 17444 setcco 18007 estrcco 18053 pwsco1mhm 18757 pwsco2mhm 18758 efmndov 18806 efmndcl 18807 symgov 19313 symgcl 19314 gsumval3lem2 19835 gsumzf1o 19841 f1lindf 21777 evls1sca 22267 tngds 24592 climcncf 24849 motplusg 28614 tocycfv 33191 smatfval 33952 eulerpartlemmf 34532 hgt750lemg 34811 cossex 38682 tgrpov 41008 erngmul 41066 erngmul-rN 41074 dvamulr 41272 dvavadd 41275 dvhmulr 41346 mendmulr 43426 relexp0a 43957 choicefi 45444 climexp 45851 dvsinax 46157 stoweidlem27 46271 stoweidlem31 46275 stoweidlem59 46303 grimco 48135 uspgrbisymrelALT 48401 rngccoALTV 48517 ringccoALTV 48551 itcoval1 48909 itcoval2 48910 itcoval3 48911 itcovalsucov 48914 |
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