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Theorem bdcun 10838
 Description: The union of two bounded classes is bounded. (Contributed by BJ, 3-Oct-2019.)
Hypotheses
Ref Expression
bdcdif.1 BOUNDED 𝐴
bdcdif.2 BOUNDED 𝐵
Assertion
Ref Expression
bdcun BOUNDED (𝐴𝐵)

Proof of Theorem bdcun
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 bdcdif.1 . . . . 5 BOUNDED 𝐴
21bdeli 10822 . . . 4 BOUNDED 𝑥𝐴
3 bdcdif.2 . . . . 5 BOUNDED 𝐵
43bdeli 10822 . . . 4 BOUNDED 𝑥𝐵
52, 4ax-bdor 10792 . . 3 BOUNDED (𝑥𝐴𝑥𝐵)
65bdcab 10825 . 2 BOUNDED {𝑥 ∣ (𝑥𝐴𝑥𝐵)}
7 df-un 2978 . 2 (𝐴𝐵) = {𝑥 ∣ (𝑥𝐴𝑥𝐵)}
86, 7bdceqir 10820 1 BOUNDED (𝐴𝐵)
 Colors of variables: wff set class Syntax hints:   ∨ wo 662   ∈ wcel 1434  {cab 2068   ∪ cun 2972  BOUNDED wbdc 10816 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-5 1377  ax-gen 1379  ax-ie1 1423  ax-ie2 1424  ax-4 1441  ax-17 1460  ax-ial 1468  ax-ext 2064  ax-bd0 10789  ax-bdor 10792  ax-bdsb 10798 This theorem depends on definitions:  df-bi 115  df-clab 2069  df-cleq 2075  df-clel 2078  df-un 2978  df-bdc 10817 This theorem is referenced by:  bdcpr  10847  bdctp  10848  bdcsuc  10856
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