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Theorem coexg 5332
Description: The composition of two sets is a set. (Contributed by NM, 19-Mar-1998.)
Assertion
Ref Expression
coexg ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∘ 𝐵) ∈ V)

Proof of Theorem coexg
StepHypRef Expression
1 cossxp 5310 . 2 (𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴)
2 dmexg 5046 . . 3 (𝐵 ∈ 𝑊 → dom 𝐵 ∈ V)
3 rnexg 5047 . . 3 (𝐴 ∈ 𝑉 → ran 𝐴 ∈ V)
4 xpexg 4889 . . 3 ((dom 𝐵 ∈ V ∧ ran 𝐴 ∈ V) → (dom 𝐵 × ran 𝐴) ∈ V)
52, 3, 4syl2anr 290 . 2 ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (dom 𝐵 × ran 𝐴) ∈ V)
6 ssexg 4272 . 2 (((𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) ∧ (dom 𝐵 × ran 𝐴) ∈ V) → (𝐴 ∘ 𝐵) ∈ V)
71, 5, 6sylancr 418 1 ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∘ 𝐵) ∈ V)
Colors of variables:    wff set class
This proof depends on syntax axioms:   → wi 4   ∧ wa 104   ∈ wcel 2209  Vcvv 2821   ⊆ wss 3220   × cxp 4772  dom cdm 4774  ran crn 4775   ∘ ccom 4778
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4249  ax-pow 4311  ax-pr 4346  ax-un 4578
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-br 4131  df-opab 4193  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785
This theorem is used by:  coex  5333  suppcofn  6506  seqf1oglem2  10972  seqf1og  10973  gzsumwmhm  13856  gzsumreidx  14225  gzsummhm  14229  gzsumshift  14233  gsumvalfi  14236  znval  15055  znle  15056  znbaslemnn  15058  climcncf  15776
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