- Constant:
**most-positive-fixnum** The immediate integer closest to positive infinity. See Configuration in SLIB.

- Constant:
**most-negative-fixnum** The immediate integer closest to negative infinity.

- Constant:
**$pi** - Constant:
**pi** The ratio of the circumference to the diameter of a circle.

These procedures are in addition to those in See Irrational Integer Functions in SLIB.

- Function:
**exact-round***x* - Function:
**exact-floor***x* - Function:
**exact-ceiling***x* - Function:
**exact-truncate***x* Return exact integers.

These procedures augment the standard capabilities in Numerical operations in Revised(5) Scheme. Many are from See Irrational Real Functions in SLIB.

- Function:
**pi****z* `(* pi`

`z`)

- Function:
**pi/***z* `(/ pi`

`z`)

- Function:
**sinh***z* - Function:
**cosh***z* - Function:
**tanh***z* Return the hyperbolic sine, cosine, and tangent of

`z`

- Function:
**asinh***z* - Function:
**acosh***z* - Function:
**atanh***z* Return the inverse hyperbolic sine, cosine, and tangent of

`z`

- Function:
**real-sqrt***x* - Function:
**real-exp***x* - Function:
**real-ln***x* - Function:
**real-sin***x* - Function:
**real-cos***x* - Function:
**real-tan***x* - Function:
**real-asin***x* - Function:
**real-acos***x* - Function:
**real-atan***x* - Function:
**atan***y x* - Function:
**real-sinh***x* - Function:
**real-cosh***x* - Function:
**real-tanh***x* - Function:
**real-asinh***x* - Function:
**real-acosh***x* - Function:
**real-atanh***x* Real-only versions of these popular functions. The argument

`x`must be a real number. It is an error if the value which should be returned by a call to these procedures is*not*real.

- Function:
**real-log10***x* Real-only base 10 logarithm.

- Function:
**$atan2***y x* Computes

`(angle (make-rectangular x y))`

for real numbers`y`and`x`.

- Function:
**real-expt***x1 x2* Returns real number

`x1`raised to the real power`x2`. It is an error if the value which should be returned by a call to`real-expt`

is not real.

- Function:
**infinite?***z* - Function:
**finite?***z* All IEEE-754 numbers except positive and negative infinity and NaN (non-a-number) are finite.