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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 6274 | . 2 ⊢ (𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) | |
| 2 | dmexg 7914 | . . 3 ⊢ (𝐵 ∈ 𝑊 → dom 𝐵 ∈ V) | |
| 3 | rnexg 7915 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ran 𝐴 ∈ V) | |
| 4 | xpexg 7765 | . . 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 5280 | . 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 2144 Vcvv 3450 ⊆ wss 3895 × cxp 5648 dom cdm 5650 ran crn 5651 ∘ ccom 5654 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-ext 2732 ax-sep 5248 ax-pow 5326 ax-pr 5390 ax-un 7752 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-sb 2099 df-clab 2739 df-cleq 2752 df-clel 2835 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-ss 3896 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-br 5103 df-opab 5167 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 |
| This theorem is used by: coex 7943 coexd 7944 suppco 8227 fsuppco2 9399 fsuppcor 9400 mapfienlem2 9402 wemapwe 9702 cofsmo 10351 relexpsucnnr 15184 supcvg 16031 imasle 17701 setcco 18264 estrcco 18310 pwsco1mhm 19034 pwsco2mhm 19035 efmndov 19083 efmndcl 19084 symgov 19604 symgcl 19605 gsumval3lem2 20126 gsumzf1o 20132 f1lindf 22134 evls1sca 22647 tngds 24973 climcncf 25227 motplusg 29011 tocycfv 33717 smatfval 34474 eulerpartlemmf 35054 hgt750lemg 35330 cossex 39535 tgrpov 41899 erngmul 41957 erngmul-rN 41965 dvamulr 42163 dvavadd 42166 dvhmulr 42237 mendmulr 44280 relexp0a 44810 choicefi 46308 climexp 46711 dvsinax 47017 stoweidlem27 47131 stoweidlem31 47135 stoweidlem59 47163 grimco 49081 uspgrbisymrelALT 49347 rngccoALTV 49462 ringccoALTV 49496 itcoval1 49869 itcoval2 49870 itcoval3 49871 itcovalsucov 49874 |
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