Theorem bdcriota 14674

Description: A class given by a restricted definition binder is bounded, under the given hypotheses. (Contributed by BJ, 24-Nov-2019.)

Hypotheses

Ref	Expression
bdcriota.bd	|- BOUNDED ph
bdcriota.ex	|- E! x e. y ph

Assertion

Ref	Expression
bdcriota	|- BOUNDED ( iota_ x e. y ph )

Distinct variable group:   x, y

Allowed substitution hints:   ph( x, y)

Proof of Theorem bdcriota

Dummy variables z t are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		bdcriota.bd	. . . . . . . . 9 |- BOUNDED ph
2	1	ax-bdsb 14613	. . . . . . . 8 |- BOUNDED [ z / x ] ph
3		ax-bdel 14612	. . . . . . . 8 |- BOUNDED t e. z
4	2, 3	ax-bdim 14605	. . . . . . 7 |- BOUNDED ( [ z / x ] ph -> t e. z )
5	4	ax-bdal 14609	. . . . . 6 |- BOUNDED A. z e. y ( [ z / x ] ph -> t e. z )
6		df-ral 2460	. . . . . . . . 9 |- ( A. z e. y ( [ z / x ] ph -> t e. z ) <-> A. z ( z e. y -> ( [ z / x ] ph -> t e. z ) ) )
7		impexp 263	. . . . . . . . . . 11 |- ( ( ( z e. y /\ [ z / x ] ph ) -> t e. z ) <-> ( z e. y -> ( [ z / x ] ph -> t e. z ) ) )
8	7	bicomi 132	. . . . . . . . . 10 |- ( ( z e. y -> ( [ z / x ] ph -> t e. z ) ) <-> ( ( z e. y /\ [ z / x ] ph ) -> t e. z ) )
9	8	albii 1470	. . . . . . . . 9 |- ( A. z ( z e. y -> ( [ z / x ] ph -> t e. z ) ) <-> A. z ( ( z e. y /\ [ z / x ] ph ) -> t e. z ) )
10	6, 9	bitri 184	. . . . . . . 8 |- ( A. z e. y ( [ z / x ] ph -> t e. z ) <-> A. z ( ( z e. y /\ [ z / x ] ph ) -> t e. z ) )
11		sban 1955	. . . . . . . . . . . 12 |- ( [ z / x ] ( x e. y /\ ph ) <-> ( [ z / x ] x e. y /\ [ z / x ] ph ) )
12		clelsb1 2282	. . . . . . . . . . . . 13 |- ( [ z / x ] x e. y <-> z e. y )
13	12	anbi1i 458	. . . . . . . . . . . 12 |- ( ( [ z / x ] x e. y /\ [ z / x ] ph ) <-> ( z e. y /\ [ z / x ] ph ) )
14	11, 13	bitri 184	. . . . . . . . . . 11 |- ( [ z / x ] ( x e. y /\ ph ) <-> ( z e. y /\ [ z / x ] ph ) )
15	14	bicomi 132	. . . . . . . . . 10 |- ( ( z e. y /\ [ z / x ] ph ) <-> [ z / x ] ( x e. y /\ ph ) )
16	15	imbi1i 238	. . . . . . . . 9 |- ( ( ( z e. y /\ [ z / x ] ph ) -> t e. z ) <-> ( [ z / x ] ( x e. y /\ ph ) -> t e. z ) )
17	16	albii 1470	. . . . . . . 8 |- ( A. z ( ( z e. y /\ [ z / x ] ph ) -> t e. z ) <-> A. z ( [ z / x ] ( x e. y /\ ph ) -> t e. z ) )
18	10, 17	bitri 184	. . . . . . 7 |- ( A. z e. y ( [ z / x ] ph -> t e. z ) <-> A. z ( [ z / x ] ( x e. y /\ ph ) -> t e. z ) )
19		df-clab 2164	. . . . . . . . . 10 |- ( z e. { x | ( x e. y /\ ph ) } <-> [ z / x ] ( x e. y /\ ph ) )
20	19	bicomi 132	. . . . . . . . 9 |- ( [ z / x ] ( x e. y /\ ph ) <-> z e. { x | ( x e. y /\ ph ) } )
21	20	imbi1i 238	. . . . . . . 8 |- ( ( [ z / x ] ( x e. y /\ ph ) -> t e. z ) <-> ( z e. { x | ( x e. y /\ ph ) } -> t e. z ) )
22	21	albii 1470	. . . . . . 7 |- ( A. z ( [ z / x ] ( x e. y /\ ph ) -> t e. z ) <-> A. z ( z e. { x | ( x e. y /\ ph ) } -> t e. z ) )
23	18, 22	bitri 184	. . . . . 6 |- ( A. z e. y ( [ z / x ] ph -> t e. z ) <-> A. z ( z e. { x | ( x e. y /\ ph ) } -> t e. z ) )
24	5, 23	bd0 14615	. . . . 5 |- BOUNDED A. z ( z e. { x | ( x e. y /\ ph ) } -> t e. z )
25	24	bdcab 14640	. . . 4 |- BOUNDED { t | A. z ( z e. { x | ( x e. y /\ ph ) } -> t e. z ) }
26		df-int 3847	. . . 4 |- |^| { x | ( x e. y /\ ph ) } = { t | A. z ( z e. { x | ( x e. y /\ ph ) } -> t e. z ) }
27	25, 26	bdceqir 14635	. . 3 |- BOUNDED |^| { x | ( x e. y /\ ph ) }
28		bdcriota.ex	. . . . 5 |- E! x e. y ph
29		df-reu 2462	. . . . 5 |- ( E! x e. y ph <-> E! x ( x e. y /\ ph ) )
30	28, 29	mpbi 145	. . . 4 |- E! x ( x e. y /\ ph )
31		iotaint 5193	. . . 4 |- ( E! x ( x e. y /\ ph ) -> ( iota x ( x e. y /\ ph ) ) = |^| { x | ( x e. y /\ ph ) } )
32	30, 31	ax-mp 5	. . 3 |- ( iota x ( x e. y /\ ph ) ) = |^| { x | ( x e. y /\ ph ) }
33	27, 32	bdceqir 14635	. 2 |- BOUNDED ( iota x ( x e. y /\ ph ) )
34		df-riota 5833	. 2 |- ( iota_ x e. y ph ) = ( iota x ( x e. y /\ ph ) )
35	33, 34	bdceqir 14635	1 |- BOUNDED ( iota_ x e. y ph )

Syntax hints:   -> wi 4   /\ wa 104   A.wal 1351   = wceq 1353   [wsb 1762   E!weu 2026   e. wcel 2148   {cab 2163   A.wral 2455   E!wreu 2457   |^|cint 3846   iotacio 5178   iota_crio 5832  BOUNDED wbd 14603  BOUNDED wbdc 14631

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-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-ext 2159  ax-bd0 14604  ax-bdim 14605  ax-bdal 14609  ax-bdel 14612  ax-bdsb 14613

This theorem depends on definitions:  df-bi 117  df-tru 1356  df-nf 1461  df-sb 1763  df-eu 2029  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ral 2460  df-rex 2461  df-reu 2462  df-v 2741  df-sbc 2965  df-un 3135  df-in 3137  df-sn 3600  df-pr 3601  df-uni 3812  df-int 3847  df-iota 5180  df-riota 5833  df-bdc 14632

This theorem is referenced by: (None)