Division by zero
----------------

                 Key: MATH-657
                 URL: https://issues.apache.org/jira/browse/MATH-657
             Project: Commons Math
          Issue Type: Bug
            Reporter: Gilles
            Assignee: Gilles
            Priority: Minor
             Fix For: 3.0


In class {{Complex}}, division by zero always returns NaN. I think that it 
should return NaN only when the numerator is also {{ZERO}}, otherwise the 
result should be {{INF}}. See 
[here|http://en.wikipedia.org/wiki/Riemann_sphere#Arithmetic_operations].


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