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Definition df-ioo 8761
Description: Define the set of open intervals of extended reals. (Contributed by NM, 24-Dec-2006.)
Assertion
Ref Expression
df-ioo  |-  (,)  =  ( x  e.  RR* ,  y  e.  RR*  |->  { z  e.  RR*  |  (
x  <  z  /\  z  <  y ) } )
Distinct variable group:    x, y, z

Detailed syntax breakdown of Definition df-ioo
StepHypRef Expression
1 cioo 8757 . 2  class  (,)
2 vx . . 3  setvar  x
3 vy . . 3  setvar  y
4 cxr 7059 . . 3  class  RR*
52cv 1242 . . . . . 6  class  x
6 vz . . . . . . 7  setvar  z
76cv 1242 . . . . . 6  class  z
8 clt 7060 . . . . . 6  class  <
95, 7, 8wbr 3764 . . . . 5  wff  x  < 
z
103cv 1242 . . . . . 6  class  y
117, 10, 8wbr 3764 . . . . 5  wff  z  < 
y
129, 11wa 97 . . . 4  wff  ( x  <  z  /\  z  <  y )
1312, 6, 4crab 2310 . . 3  class  { z  e.  RR*  |  (
x  <  z  /\  z  <  y ) }
142, 3, 4, 4, 13cmpt2 5514 . 2  class  ( x  e.  RR* ,  y  e. 
RR*  |->  { z  e. 
RR*  |  ( x  <  z  /\  z  < 
y ) } )
151, 14wceq 1243 1  wff  (,)  =  ( x  e.  RR* ,  y  e.  RR*  |->  { z  e.  RR*  |  (
x  <  z  /\  z  <  y ) } )
Colors of variables: wff set class
This definition is referenced by:  iooex  8776  iooval  8777  elioo3g  8779  elioo1  8780  iooss1  8785  iooss2  8786  eliooxr  8796  iccssioo  8811  ioossicc  8828  ioossico  8831  iocssioo  8832  icossioo  8833  ioossioo  8834  ioof  8840  ioodisj  8861
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