.ta +11 +10 +39
.na
.TP 60
\fBType\fP	\fBOperator\fP	\fBPOSTGRES Function Prototype\fP
\fBOperation\fP
.TP 60
box	@@	point box_center(box)
center of box
.TP 60
float4	@	float4 float4abs(float4)
absolute value
.TP 60
float8	@	float8 float8abs(float8)
absolute value
.TP 60
	%	float8 dtrunc(float8)
truncate to integer
.TP 60
	|/	float8 dsqrt(float8)
square root
.TP 60
	||/	float8 dcbrt(float8)
cube root
.TP 60
	:	float8 dexp(float8)
exponential function
.TP 60
	;	float8 dlog1(float8)
natural logarithm
.TP 60
tinterval	|	abstime intervalstart(tinterval)
start of interval
.ad b