Definition df-icc 8764

Description: Define the set of closed intervals of extended reals. (Contributed by NM, 24-Dec-2006.)

Assertion

Ref	Expression
df-icc	|- [,] = ( 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-icc

Step	Hyp	Ref	Expression
1		cicc 8760	. 2 class [,]
2		vx	. . 3 setvar x
3		vy	. . 3 setvar y
4		cxr 7059	. . 3 class RR*
5	2	cv 1242	. . . . . 6 class x
6		vz	. . . . . . 7 setvar z
7	6	cv 1242	. . . . . 6 class z
8		cle 7061	. . . . . 6 class <_
9	5, 7, 8	wbr 3764	. . . . 5 wff x <_ z
10	3	cv 1242	. . . . . 6 class y
11	7, 10, 8	wbr 3764	. . . . 5 wff z <_ y
12	9, 11	wa 97	. . . 4 wff ( x <_ z /\ z <_ y )
13	12, 6, 4	crab 2310	. . 3 class { z e. RR* | ( x <_ z /\ z <_ y ) }
14	2, 3, 4, 4, 13	cmpt2 5514	. 2 class ( x e. RR* , y e. RR* |-> { z e. RR* | ( x <_ z /\ z <_ y ) } )
15	1, 14	wceq 1243	1 wff [,] = ( x e. RR* , y e. RR* |-> { z e. RR* | ( x <_ z /\ z <_ y ) } )

This definition is referenced by:  iccval  8789  elicc1  8793  iccss  8810  iccssioo  8811  iccss2  8813  iccssico  8814  iccssxr  8825  ioossicc  8828  icossicc  8829  iocssicc  8830  iccf  8841  ioodisj  8861