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Howard K. Fehr's notes
Autor:
Doug Kuhlmann
A readable if not perfect pdf copy of the section from Fehr that describes this technique. (1951) Fehr was head of the Teaching of Mathematics dept in Teacher's College Columbia.
Fehr_1951_ComplexGraphs.pdf
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ZerpflückenKegelGleichung02
פתרון משוואה ריבועית ax^2+c = m
McDonalds
tangente approach
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