Theorem bdciun 15524

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 15492	. . . 4 |- BOUNDED z e. A
3	2	ax-bdex 15465	. . 3 |- BOUNDED E. x e. y z e. A
4	3	bdcab 15495	. 2 |- BOUNDED { z | E. x e. y z e. A }
5		df-iun 3918	. 2 |- U_ x e. y A = { z | E. x e. y z e. A }
6	4, 5	bdceqir 15490	1 |- BOUNDED U_ x e. y A

Syntax hints:   e. wcel 2167   {cab 2182   E.wrex 2476   U_ciun 3916  BOUNDED wbdc 15486

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1461  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-4 1524  ax-17 1540  ax-ial 1548  ax-ext 2178  ax-bd0 15459  ax-bdex 15465  ax-bdsb 15468

This theorem depends on definitions:  df-bi 117  df-clab 2183  df-cleq 2189  df-clel 2192  df-iun 3918  df-bdc 15487

This theorem is referenced by: (None)