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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 6276 | . 2 ⊢ (𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) | |
| 2 | dmexg 7900 | . . 3 ⊢ (𝐵 ∈ 𝑊 → dom 𝐵 ∈ V) | |
| 3 | rnexg 7901 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ran 𝐴 ∈ V) | |
| 4 | xpexg 7751 | . . 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 5292 | . 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 2146 Vcvv 3457 ⊆ wss 3906 × cxp 5661 dom cdm 5663 ran crn 5664 ∘ ccom 5667 |
| 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 2148 ax-9 2156 ax-ext 2737 ax-sep 5259 ax-pow 5338 ax-pr 5406 ax-un 7738 |
| 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 2744 df-cleq 2757 df-clel 2840 df-ral 3082 df-rex 3092 df-rab 3419 df-v 3459 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-br 5112 df-opab 5176 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 |
| This theorem is used by: coex 7929 coexd 7930 suppco 8204 fsuppco2 9366 fsuppcor 9367 mapfienlem2 9369 wemapwe 9669 cofsmo 10264 relexpsucnnr 15081 supcvg 15928 imasle 17594 setcco 18157 estrcco 18203 pwsco1mhm 18914 pwsco2mhm 18915 efmndov 18963 efmndcl 18964 symgov 19477 symgcl 19478 gsumval3lem2 19999 gsumzf1o 20005 f1lindf 22001 evls1sca 22512 tngds 24834 climcncf 25088 motplusg 28840 tocycfv 33452 smatfval 34208 eulerpartlemmf 34789 hgt750lemg 35065 cossex 39191 tgrpov 41555 erngmul 41613 erngmul-rN 41621 dvamulr 41819 dvavadd 41822 dvhmulr 41893 mendmulr 43944 relexp0a 44475 choicefi 45950 climexp 46354 dvsinax 46660 stoweidlem27 46774 stoweidlem31 46778 stoweidlem59 46806 grimco 48687 uspgrbisymrelALT 48953 rngccoALTV 49069 ringccoALTV 49103 itcoval1 49476 itcoval2 49477 itcoval3 49478 itcovalsucov 49481 |
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