Theorem ixxval 12183

Description: Value of the interval function. (Contributed by Mario Carneiro, 3-Nov-2013.)

Hypothesis

Ref	Expression
ixx.1	|- O = ( x e. RR* , y e. RR* |-> { z e. RR* | ( x R z /\ z S y ) } )

Assertion

Ref	Expression
ixxval	|- ( ( A e. RR* /\ B e. RR* ) -> ( A O B ) = { z e. RR* | ( A R z /\ z S B ) } )

Distinct variable groups:   x, y, z, A   x, B, y, z   x, R, y, z   x, S, y, z

Allowed substitution hints:   O( x, y, z)

Proof of Theorem ixxval

Step	Hyp	Ref	Expression
1		breq1 4656	. . . 4 |- ( x = A -> ( x R z <-> A R z ) )
2	1	anbi1d 741	. . 3 |- ( x = A -> ( ( x R z /\ z S y ) <-> ( A R z /\ z S y ) ) )
3	2	rabbidv 3189	. 2 |- ( x = A -> { z e. RR* | ( x R z /\ z S y ) } = { z e. RR* | ( A R z /\ z S y ) } )
4		breq2 4657	. . . 4 |- ( y = B -> ( z S y <-> z S B ) )
5	4	anbi2d 740	. . 3 |- ( y = B -> ( ( A R z /\ z S y ) <-> ( A R z /\ z S B ) ) )
6	5	rabbidv 3189	. 2 |- ( y = B -> { z e. RR* | ( A R z /\ z S y ) } = { z e. RR* | ( A R z /\ z S B ) } )
7		ixx.1	. 2 |- O = ( x e. RR* , y e. RR* |-> { z e. RR* | ( x R z /\ z S y ) } )
8		xrex 11829	. . 3 |- RR* e. _V
9	8	rabex 4813	. 2 |- { z e. RR* | ( A R z /\ z S B ) } e. _V
10	3, 6, 7, 9	ovmpt2 6796	1 |- ( ( A e. RR* /\ B e. RR* ) -> ( A O B ) = { z e. RR* | ( A R z /\ z S B ) } )

Syntax hints:   -> wi 4   /\ wa 384   = wceq 1483   e. wcel 1990   {crab 2916   class class class wbr 4653  (class class class)co 6650   |-> cmpt2 6652   RR*cxr 10073

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-sbc 3436  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-iota 5851  df-fun 5890  df-fv 5896  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-xr 10078

This theorem is referenced by:  elixx1  12184  ixxin  12192  iooval  12199  iocval  12212  icoval  12213  iccval  12214