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Theorem rnun 4827
Description: Distributive law for range over union. Theorem 8 of [Suppes] p. 60. (Contributed by NM, 24-Mar-1998.)
Assertion
Ref Expression
rnun ran (𝐴𝐵) = (ran 𝐴 ∪ ran 𝐵)

Proof of Theorem rnun
StepHypRef Expression
1 cnvun 4824 . . . 4 (𝐴𝐵) = (𝐴𝐵)
21dmeqi 4625 . . 3 dom (𝐴𝐵) = dom (𝐴𝐵)
3 dmun 4631 . . 3 dom (𝐴𝐵) = (dom 𝐴 ∪ dom 𝐵)
42, 3eqtri 2108 . 2 dom (𝐴𝐵) = (dom 𝐴 ∪ dom 𝐵)
5 df-rn 4439 . 2 ran (𝐴𝐵) = dom (𝐴𝐵)
6 df-rn 4439 . . 3 ran 𝐴 = dom 𝐴
7 df-rn 4439 . . 3 ran 𝐵 = dom 𝐵
86, 7uneq12i 3150 . 2 (ran 𝐴 ∪ ran 𝐵) = (dom 𝐴 ∪ dom 𝐵)
94, 5, 83eqtr4i 2118 1 ran (𝐴𝐵) = (ran 𝐴 ∪ ran 𝐵)
Colors of variables: wff set class
Syntax hints:   = wceq 1289  cun 2995  ccnv 4427  dom cdm 4428  ran crn 4429
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 665  ax-5 1381  ax-7 1382  ax-gen 1383  ax-ie1 1427  ax-ie2 1428  ax-8 1440  ax-10 1441  ax-11 1442  ax-i12 1443  ax-bndl 1444  ax-4 1445  ax-17 1464  ax-i9 1468  ax-ial 1472  ax-i5r 1473  ax-ext 2070
This theorem depends on definitions:  df-bi 115  df-3an 926  df-tru 1292  df-nf 1395  df-sb 1693  df-clab 2075  df-cleq 2081  df-clel 2084  df-nfc 2217  df-v 2621  df-un 3001  df-in 3003  df-ss 3010  df-sn 3447  df-pr 3448  df-op 3450  df-br 3838  df-opab 3892  df-cnv 4436  df-dm 4438  df-rn 4439
This theorem is referenced by:  imaundi  4831  imaundir  4832  rnpropg  4897  fun  5168  foun  5256  fpr  5463  fprg  5464  sbthlemi6  6650  exmidfodomrlemim  6806
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