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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 6273 | . 2 ⊢ (𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) | |
| 2 | dmexg 7894 | . . 3 ⊢ (𝐵 ∈ 𝑊 → dom 𝐵 ∈ V) | |
| 3 | rnexg 7895 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ran 𝐴 ∈ V) | |
| 4 | xpexg 7745 | . . 3 ⊢ ((dom 𝐵 ∈ V ∧ ran 𝐴 ∈ V) → (dom 𝐵 × ran 𝐴) ∈ V) | |
| 5 | 2, 3, 4 | syl2anr 608 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (dom 𝐵 × ran 𝐴) ∈ V) |
| 6 | ssexg 5290 | . 2 ⊢ (((𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) ∧ (dom 𝐵 × ran 𝐴) ∈ V) → (𝐴 ∘ 𝐵) ∈ V) | |
| 7 | 1, 5, 6 | sylancr 598 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∘ 𝐵) ∈ V) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 400 ∈ wcel 2143 Vcvv 3455 ⊆ wss 3905 × cxp 5659 dom cdm 5661 ran crn 5662 ∘ ccom 5665 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-ext 2735 ax-sep 5257 ax-pow 5336 ax-pr 5404 ax-un 7732 |
| This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-sb 2097 df-clab 2742 df-cleq 2755 df-clel 2838 df-ral 3080 df-rex 3090 df-rab 3417 df-v 3457 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-nul 4287 df-if 4488 df-pw 4564 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4873 df-br 5110 df-opab 5174 df-xp 5667 df-rel 5668 df-cnv 5669 df-co 5670 df-dm 5671 df-rn 5672 |
| This theorem is used by: coex 7923 coexd 7924 suppco 8198 fsuppco2 9359 fsuppcor 9360 mapfienlem2 9362 wemapwe 9662 cofsmo 10257 relexpsucnnr 15067 supcvg 15915 imasle 17581 setcco 18144 estrcco 18190 pwsco1mhm 18895 pwsco2mhm 18896 efmndov 18944 efmndcl 18945 symgov 19458 symgcl 19459 gsumval3lem2 19980 gsumzf1o 19986 f1lindf 21981 evls1sca 22492 tngds 24814 climcncf 25068 motplusg 28820 tocycfv 33438 smatfval 34194 eulerpartlemmf 34774 hgt750lemg 35050 cossex 39186 tgrpov 41550 erngmul 41608 erngmul-rN 41616 dvamulr 41814 dvavadd 41817 dvhmulr 41888 mendmulr 43939 relexp0a 44470 choicefi 45945 climexp 46349 dvsinax 46655 stoweidlem27 46769 stoweidlem31 46773 stoweidlem59 46801 grimco 48682 uspgrbisymrelALT 48948 rngccoALTV 49064 ringccoALTV 49098 itcoval1 49471 itcoval2 49472 itcoval3 49473 itcovalsucov 49476 |
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