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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 6269 | . 2 ⊢ (𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) | |
| 2 | dmexg 7898 | . . 3 ⊢ (𝐵 ∈ 𝑊 → dom 𝐵 ∈ V) | |
| 3 | rnexg 7899 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ran 𝐴 ∈ V) | |
| 4 | xpexg 7749 | . . 3 ⊢ ((dom 𝐵 ∈ V ∧ ran 𝐴 ∈ V) → (dom 𝐵 × ran 𝐴) ∈ V) | |
| 5 | 2, 3, 4 | syl2anr 609 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (dom 𝐵 × ran 𝐴) ∈ V) |
| 6 | ssexg 5284 | . 2 ⊢ (((𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) ∧ (dom 𝐵 × ran 𝐴) ∈ V) → (𝐴 ∘ 𝐵) ∈ V) | |
| 7 | 1, 5, 6 | sylancr 599 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∘ 𝐵) ∈ V) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∈ wcel 2145 Vcvv 3450 ⊆ wss 3899 × cxp 5653 dom cdm 5655 ran crn 5656 ∘ 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: coex 7927 coexd 7928 suppco 8204 fsuppco2 9373 fsuppcor 9374 mapfienlem2 9376 wemapwe 9676 cofsmo 10271 relexpsucnnr 15098 supcvg 15945 imasle 17609 setcco 18172 estrcco 18218 pwsco1mhm 18941 pwsco2mhm 18942 efmndov 18990 efmndcl 18991 symgov 19511 symgcl 19512 gsumval3lem2 20033 gsumzf1o 20039 f1lindf 22035 evls1sca 22548 tngds 24874 climcncf 25128 motplusg 28884 tocycfv 33549 smatfval 34305 eulerpartlemmf 34886 hgt750lemg 35162 cossex 39257 tgrpov 41621 erngmul 41679 erngmul-rN 41687 dvamulr 41885 dvavadd 41888 dvhmulr 41959 mendmulr 44025 relexp0a 44556 choicefi 46031 climexp 46435 dvsinax 46741 stoweidlem27 46855 stoweidlem31 46859 stoweidlem59 46887 grimco 48805 uspgrbisymrelALT 49071 rngccoALTV 49186 ringccoALTV 49220 itcoval1 49593 itcoval2 49594 itcoval3 49595 itcovalsucov 49598 |
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