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The multiple valued version of log(z) is a set, but it is easier to write it without braces and using it in formulas follows obvious rules. log(z) is the set of complex numbers v which satisfy e v = z; arg(z) is the set of possible values of the arg function applied to z. When k is any integer:
The real part of log(z) is the natural logarithm of | z |. Its graph is thus obtained by rotating the graph of ln(x) around the z-axis. In mathematics, a complex logarithm is a generalization of the natural logarithm to nonzero complex numbers. The term refers to one of the following, which are strongly related:
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Bell Centennial is a sans-serif typeface in the industrial or grotesque style designed by Matthew Carter in the period 1975–1978. The typeface was commissioned by AT&T as a proprietary type to replace their then current directory typeface Bell Gothic on the occasion of AT&T's one hundredth anniversary.
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