The type(x, infinity) function returns true if x is one of the following:

1.  infinity or -infinity

2.  a floating-point number whose exponent is infinity

3.  a nonreal, where at least one of the arguments satisfies either (1) or (2)

Note: A nonreal is a complex constant which is not of type extended_numeric and where Re(x) (if present) and Im(x) are of type extended_numeric.

You can enter infinity using 1-D or 2-D math, as infinity or .

The type(x, cx_infinity) function returns true if x is a 2-argument nonreal, where each argument is of type infinity.

The type(x, real_infinity) function returns true if x is of type extended_numeric and type infinity.

The type(x, pos_infinity) function returns true if x is a positive real_infinity.

The type(x, neg_infinity) function returns true if x is a negative real_infinity.

The type(x, SymbolicInfinity) function returns true if x is either

1.  of type infinity

2.  a product with at least one factor of type infinity

A complex extended_numeric object in which one component is of type infinity and the other is of type undefined is considered to be of both types infinity and undefined.  In most computations, however, such an object is considered to be an infinity first, and an undefined second. See the last example below.