Theorem ixxex 9965

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 9922	. . . 4 |- RR* e. _V
2	1, 1	xpex 4774	. . 3 |- ( RR* X. RR* ) e. _V
3	1	pwex 4212	. . 3 |- ~P RR* e. _V
4	2, 3	xpex 4774	. 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 9964	. . 3 |- O : ( RR* X. RR* ) --> ~P RR*
7		fssxp 5421	. . 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 4167	1 |- O e. _V

Syntax hints:   /\ wa 104   = wceq 1364   e. wcel 2164   {crab 2476   _Vcvv 2760   C_ wss 3153   ~Pcpw 3601   class class class wbr 4029   X. cxp 4657   -->wf 5250   e. cmpo 5920   RR*cxr 8053

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 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-13 2166  ax-14 2167  ax-ext 2175  ax-sep 4147  ax-pow 4203  ax-pr 4238  ax-un 4464  ax-cnex 7963  ax-resscn 7964

This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1472  df-sb 1774  df-eu 2045  df-mo 2046  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-ral 2477  df-rex 2478  df-rab 2481  df-v 2762  df-sbc 2986  df-csb 3081  df-un 3157  df-in 3159  df-ss 3166  df-pw 3603  df-sn 3624  df-pr 3625  df-op 3627  df-uni 3836  df-iun 3914  df-br 4030  df-opab 4091  df-mpt 4092  df-id 4324  df-xp 4665  df-rel 4666  df-cnv 4667  df-co 4668  df-dm 4669  df-rn 4670  df-res 4671  df-ima 4672  df-iota 5215  df-fun 5256  df-fn 5257  df-f 5258  df-fv 5262  df-oprab 5922  df-mpo 5923  df-1st 6193  df-2nd 6194  df-pnf 8056  df-mnf 8057  df-xr 8058

This theorem is referenced by:  iooex  9973