A German missionary and linguist. He is seen as one of the founders of modern African linguistics. He was born 1875 in Baden near Bremen where he died 1956.
1927 he published a Practical Orthography of African Languages which became later known as the Westermann script.
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... are complex conjugates of each other. (In this case, the parabola does not intersect the x-axis at all.)
Note that when computing roots numerically, the usual form ...