Theorem bdciun 16818

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 16786	. . . 4 |- BOUNDED z e. A
3	2	ax-bdex 16759	. . 3 |- BOUNDED E. x e. y z e. A
4	3	bdcab 16789	. 2 |- BOUNDED { z | E. x e. y z e. A }
5		df-iun 4009	. 2 |- U_ x e. y A = { z | E. x e. y z e. A }
6	4, 5	bdceqir 16784	1 |- BOUNDED U_ x e. y A

Syntax hints:   e. wcel 2209   {cab 2224   E.wrex 2529   U_ciun 4007  BOUNDED wbdc 16780

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 1500  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-4 1563  ax-17 1579  ax-ial 1587  ax-ext 2220  ax-bd0 16753  ax-bdex 16759  ax-bdsb 16762

This theorem depends on definitions:  df-bi 117  df-clab 2225  df-cleq 2231  df-clel 2234  df-iun 4009  df-bdc 16781

This theorem is referenced by: (None)