Theorem ixxex 10283

Description: The set of intervals of extended reals exists. (Contributed by Mario Carneiro, 3-Nov-2013.) (Revised by Mario Carneiro, 17-Nov-2014.)

Hypothesis

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

Assertion

Ref	Expression
ixxex	|- O e. _V

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

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

Proof of Theorem ixxex

Step	Hyp	Ref	Expression
1		xrex 10240	. . . 4 |- RR* e. _V
2	1, 1	xpex 4889	. . 3 |- ( RR* X. RR* ) e. _V
3	1	pwex 4318	. . 3 |- ~P RR* e. _V
4	2, 3	xpex 4889	. 2 |- ( ( RR* X. RR* ) X. ~P RR* ) e. _V
5		ixx.1	. . . 4 |- O = ( x e. RR* , y e. RR* |-> { z e. RR* | ( x R z /\ z S y ) } )
6	5	ixxf 10282	. . 3 |- O : ( RR* X. RR* ) --> ~P RR*
7		fssxp 5553	. . 3 |- ( O : ( RR* X. RR* ) --> ~P RR* -> O C_ ( ( RR* X. RR* ) X. ~P RR* ) )
8	6, 7	ax-mp 5	. 2 |- O C_ ( ( RR* X. RR* ) X. ~P RR* )
9	4, 8	ssexi 4269	1 |- O e. _V

Syntax hints:   /\ wa 104   = wceq 1402   e. wcel 2209   {crab 2532   _Vcvv 2821   C_ wss 3220   ~Pcpw 3688   class class class wbr 4128   X. cxp 4770   -->wf 5371   e. cmpo 6080   RR*cxr 8352

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 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4247  ax-pow 4309  ax-pr 4344  ax-un 4576  ax-cnex 8263  ax-resscn 8264

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3714  df-pr 3715  df-op 3717  df-uni 3934  df-iun 4012  df-br 4129  df-opab 4191  df-mpt 4192  df-id 4436  df-xp 4778  df-rel 4779  df-cnv 4780  df-co 4781  df-dm 4782  df-rn 4783  df-res 4784  df-ima 4785  df-iota 5335  df-fun 5377  df-fn 5378  df-f 5379  df-fv 5383  df-oprab 6082  df-mpo 6083  df-1st 6367  df-2nd 6368  df-pnf 8355  df-mnf 8356  df-xr 8357

This theorem is referenced by:  iooex  10291