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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 6164 | . 2 ⊢ (𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) | |
2 | dmexg 7724 | . . 3 ⊢ (𝐵 ∈ 𝑊 → dom 𝐵 ∈ V) | |
3 | rnexg 7725 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ran 𝐴 ∈ V) | |
4 | xpexg 7578 | . . 3 ⊢ ((dom 𝐵 ∈ V ∧ ran 𝐴 ∈ V) → (dom 𝐵 × ran 𝐴) ∈ V) | |
5 | 2, 3, 4 | syl2anr 596 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (dom 𝐵 × ran 𝐴) ∈ V) |
6 | ssexg 5242 | . 2 ⊢ (((𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) ∧ (dom 𝐵 × ran 𝐴) ∈ V) → (𝐴 ∘ 𝐵) ∈ V) | |
7 | 1, 5, 6 | sylancr 586 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∘ 𝐵) ∈ V) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2108 Vcvv 3422 ⊆ wss 3883 × cxp 5578 dom cdm 5580 ran crn 5581 ∘ ccom 5584 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-clab 2716 df-cleq 2730 df-clel 2817 df-ral 3068 df-rex 3069 df-rab 3072 df-v 3424 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-op 4565 df-uni 4837 df-br 5071 df-opab 5133 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 |
This theorem is referenced by: coex 7751 suppco 7993 fsuppco2 9092 fsuppcor 9093 mapfienlem2 9095 wemapwe 9385 cofsmo 9956 relexpsucnnr 14664 supcvg 15496 imasle 17151 setcco 17714 estrcco 17762 pwsco1mhm 18385 pwsco2mhm 18386 efmndov 18435 efmndcl 18436 symgov 18906 symgcl 18907 gsumval3lem2 19422 gsumzf1o 19428 f1lindf 20939 evls1sca 21399 tngds 23717 tngdsOLD 23718 climcncf 23969 motplusg 26807 tocycfv 31278 smatfval 31647 eulerpartlemmf 32242 hgt750lemg 32534 cossex 36469 tgrpov 38689 erngmul 38747 erngmul-rN 38755 dvamulr 38953 dvavadd 38956 dvhmulr 39027 mendmulr 40929 relexp0a 41213 choicefi 42629 climexp 43036 dvsinax 43344 stoweidlem27 43458 stoweidlem31 43462 stoweidlem59 43490 uspgrbisymrelALT 45205 rngccoALTV 45434 ringccoALTV 45497 itcoval1 45897 itcoval2 45898 itcoval3 45899 itcovalsucov 45902 |
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