Pic and Ideal are two (batch) drawing programs that work with Unix formatting tools.  The guy who wrote Ideal (in FortranLanguage) started a talk with the statement: "First you've got to believe ''complex numbers are your friends''."

So, the guy knew ComplexNumbersArePoints, just like DaveDodson told me years before.
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See also ComplexNumbersAreYourFriend
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CategoryMath