Theorem bdciun 13760

Description: The indexed union of a bounded class with a setvar indexing set is a bounded class. (Contributed by BJ, 16-Oct-2019.)

Hypothesis

Ref	Expression
bdciun.1	|- BOUNDED A

Assertion

Ref	Expression
bdciun	|- BOUNDED U_ x e. y A

Distinct variable group:   x, y

Allowed substitution hints:   A( x, y)

Proof of Theorem bdciun

Dummy variable z is distinct from all other variables.

Step	Hyp	Ref	Expression
1		bdciun.1	. . . . 5 |- BOUNDED A
2	1	bdeli 13728	. . . 4 |- BOUNDED z e. A
3	2	ax-bdex 13701	. . 3 |- BOUNDED E. x e. y z e. A
4	3	bdcab 13731	. 2 |- BOUNDED { z | E. x e. y z e. A }
5		df-iun 3868	. 2 |- U_ x e. y A = { z | E. x e. y z e. A }
6	4, 5	bdceqir 13726	1 |- BOUNDED U_ x e. y A

Syntax hints:   e. wcel 2136   {cab 2151   E.wrex 2445   U_ciun 3866  BOUNDED wbdc 13722

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-5 1435  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-4 1498  ax-17 1514  ax-ial 1522  ax-ext 2147  ax-bd0 13695  ax-bdex 13701  ax-bdsb 13704

This theorem depends on definitions:  df-bi 116  df-clab 2152  df-cleq 2158  df-clel 2161  df-iun 3868  df-bdc 13723

This theorem is referenced by: (None)