Returns the greater of two  float values.  That is,
 the result is the argument closer to positive infinity. If the
 arguments have the same value, the result is that same
 value. If either value is NaN, then the result is NaN.  Unlike
 the numerical comparison operators, this method considers
 negative zero to be strictly smaller than positive zero. If one
 argument is positive zero and the other negative zero, the
 result is positive zero.
| a | an argument. | |
| b | another argument. | 
 a and  b.
Diagram: Math