5.16.2 Usual functions

max takes as argument two real numbers and
returns their maximum,
 min takes as argument two real numbers and returns
their minimum,
 abs takes as argument a complex number and returns the
modulus of the complex parameter (the absolute value if the complex is
real),
 sign takes as argument a real number and returns its
sign (+1 if it is positive, 0 if it is null, and 1 if it is
negative),
 floor (or iPart)
takes as argument a real number r,
and returns the largest integer ≤ r,
 round takes as argument a real number and returns
its nearest integer,
 ceil or ceiling takes as
argument a real number and returns the smallest integer ≥ r
 frac (or fPart) takes as
argument a real number and returns its fractional part,
 trunc takes as
argument a real number and returns the integer equal to the real without its
fractional part,
 id is the identity function,
 sq is the square function,
 sqrt is the squareroot function,
 exp is the exponential function,
 log or ln is the
natural logarithm function,
 log10 is the base10 logarithm function,
 logb is the logarithm function where the second
argument is the base of the logarithm:
logb(7,10)=log10(7)=log(7)/log(10),
 sin (resp. cos,
tan)
is the sinus function, cosinus function, tangent function,
 cot, sec, csc are the cotangent, secant, cosecant function
 asin (or arcsin),
acos (or arccos),
atan (or arctan),
acot, asec, acsc are the inverse trigonometric functions (see
section 5.21.1 for more info on trigonometric functions)
 sinh (resp. cosh,
tanh)
is the hyperbolic sinus function, cosinus function, tangent function,
 asinh or arcsinh (resp.
acosh or arccosh,
atanh or arctanh)
is the inverse function of sinh (resp. cosh, tanh)