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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 7911 | . . 3 ⊢ (𝐵 ∈ 𝑊 → dom 𝐵 ∈ V) | |
| 3 | rnexg 7912 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ran 𝐴 ∈ V) | |
| 4 | xpexg 7762 | . . 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 5281 | . 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 3451 ⊆ wss 3899 × cxp 5649 dom cdm 5651 ran crn 5652 ∘ ccom 5655 |
| 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 2733 ax-sep 5249 ax-pow 5327 ax-pr 5391 ax-un 7749 |
| 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 2740 df-cleq 2753 df-clel 2836 df-ral 3078 df-rex 3088 df-rab 3414 df-v 3453 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 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 |
| This theorem is used by: coex 7940 coexd 7941 suppco 8216 fsuppco2 9388 fsuppcor 9389 mapfienlem2 9391 wemapwe 9691 cofsmo 10340 relexpsucnnr 15171 supcvg 16018 imasle 17688 setcco 18251 estrcco 18297 pwsco1mhm 19021 pwsco2mhm 19022 efmndov 19070 efmndcl 19071 symgov 19591 symgcl 19592 gsumval3lem2 20113 gsumzf1o 20119 f1lindf 22121 evls1sca 22634 tngds 24960 climcncf 25214 motplusg 28998 tocycfv 33663 smatfval 34420 eulerpartlemmf 35000 hgt750lemg 35276 cossex 39421 tgrpov 41785 erngmul 41843 erngmul-rN 41851 dvamulr 42049 dvavadd 42052 dvhmulr 42123 mendmulr 44170 relexp0a 44701 choicefi 46183 climexp 46586 dvsinax 46892 stoweidlem27 47006 stoweidlem31 47010 stoweidlem59 47038 grimco 48956 uspgrbisymrelALT 49222 rngccoALTV 49337 ringccoALTV 49371 itcoval1 49744 itcoval2 49745 itcoval3 49746 itcovalsucov 49749 |
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