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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 6298 | . 2 ⊢ (𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) | |
| 2 | dmexg 7947 | . . 3 ⊢ (𝐵 ∈ 𝑊 → dom 𝐵 ∈ V) | |
| 3 | rnexg 7948 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ran 𝐴 ∈ V) | |
| 4 | xpexg 7796 | . . 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 5288 | . 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 2147 Vcvv 3454 ⊆ wss 3900 × cxp 5656 dom cdm 5658 ran crn 5659 ∘ ccom 5662 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-ext 2735 ax-sep 5255 ax-pow 5334 ax-pr 5398 ax-un 7783 |
| 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 2102 df-clab 2742 df-cleq 2755 df-clel 2839 df-ral 3081 df-rex 3091 df-rab 3417 df-v 3456 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-br 5109 df-opab 5174 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 |
| This theorem is used by: coex 7976 coexd 7977 suppco 8261 fsuppco2 9432 fsuppcor 9433 mapfienlem2 9435 wemapwe 9735 cofsmo 10386 relexpsucnnr 15221 supcvg 16069 imasle 17745 setcco 18308 estrcco 18354 pwsco1mhm 19078 pwsco2mhm 19079 efmndov 19127 efmndcl 19128 symgov 19649 symgcl 19650 gsumval3lem2 20171 gsumzf1o 20177 f1lindf 22183 evls1sca 22696 tngds 25022 climcncf 25276 motplusg 29062 tocycfv 33769 smatfval 34538 eulerpartlemmf 35118 hgt750lemg 35394 cossex 39707 tgrpov 42071 erngmul 42129 erngmul-rN 42137 dvamulr 42335 dvavadd 42338 dvhmulr 42409 mendmulr 44447 relexp0a 44977 choicefi 46487 climexp 46890 dvsinax 47196 stoweidlem27 47310 stoweidlem31 47314 stoweidlem59 47342 grimco 49260 uspgrbisymrelALT 49526 rngccoALTV 49641 ringccoALTV 49675 itcoval1 50106 itcoval2 50107 itcoval3 50108 itcovalsucov 50111 |
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