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Geomancy

Geomancy is the divination by means of lines and figures or by geographic features; a kind of divination by means of figures or lines, formed by little dots or points, originally on the earth, and latterly on paper.

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Quadratic formula

... is zero, then there is a repeated solution x, and this solution is real. (Geometrically, this means that the parabola described by the quadratic equation touches ...