math module
============================================================================

This module contains mathematical functions and constants.

Unless specified otherwise, all the functions of this library assume that
their parameter is an item (1-d tuple). If more that one item is passed
to a function, only the first item will be used and the others will be
ignored.
  
Math constants
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The following constants are defined:

- `math.INFINITY`: Infinity.
- `math.PI`: Ratio of the a circle's circumference to its diameter, approximately 3.14159.
- `math.E`: Euler's constant and the base of natural logarithms, approximately 2.718.
  
Trigonometric functions
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The Numb namespace contains the following trigonometric functions: 

- `math.cos`:  Returns the cosine of a number.
- `math.sin`:  Returns the sine of a number.
- `math.tan`:  Returns the tangent of a number.
- `math.acos`: Returns the arccosine of a number.
- `math.asin`: Returns the arcsine of a number.
- `math.atan`: Returns the arctangent of a number.

If the argument is not a number, these functions return `Undefined('Number')`.
  
Hyperbolic functions
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The Numb namespace contains the following hyperbolic functions: 

- `math.cosh`:  Returns the hyperbolic cosine of a number.
- `math.sinh`:  Returns the hyperbolic sine of a number.
- `math.tanh`:  Returns the hyperbolic tangent of a number.
- `math.acosh`: Returns the hyperbolic arccosine of a number.
- `math.asinh`: Returns the hyperbolic arcsine of a number.
- `math.atanh`: Returns the hyperbolic arctangent of a number.

If the argument is not a number, these functions return `Undefined('Number')`.
  
Rounding
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The following functions perform number rounding. 

- `math.ceil`: Returns the smallest integer greater than or equal to a number.
- `math.floor`: Returns the largest integer less than or equal to a number.
- `math.trunc`: Returns the integer part of the number x, removing any fractional digits.
- `math.round`: Returns the value of a number rounded to the nearest integer.

If the argument is not a number, these functions return `Undefined('Number')`.
  
math.abs - function
------------------------------------------------------------------------
Returns the absolute value of a number. 
If the argument is not a number, this functions return `Undefined('Number')`.
  
math.exp - function
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Returns E^x, where x is the argument, and E is Euler's constant. 
If the argument is not a number, this functions return `Undefined('Number')`.
  
math.log - function
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Returns the natural logarithm of a number. 
If the argument is not a number, this functions return `Undefined('Number')`.
  
math.log10 - function
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Returns the base 10 logarithm of a number. 
If the argument is not a number, this functions return `Undefined('Number')`.
  
math.max - function
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Returns the largest of zero or more numbers.
If any argument is not a number, this functions return `Undefined('Number')`.
  
math.min - function
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Returns the smallest of zero or more numbers.
If any argument is not a number, this functions return `Undefined('Number')`.
  
math.random - function
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Returns a pseudo-random number between 0 and the given argument.
If the argument is not a number, this functions return `Undefined('Number')`.
  
math.sqrt - function
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Returns the positive square root of a number.
If any argument is not a number, this functions return `Undefined('Number')`.