laguerre
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laguerre(a,x)
Given the coefficients a(1:m+1) of the m'th degree
complex polynomial Sum(a(i)*x^(i-1)) and a guess x, returns a root.
See Numerical Recipes (Press, et. al., Cambridge Univ. Press 1988),
section 9.5.
interpreted function, defined at i/zroots.i line 70
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