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Grade (bouldering)

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Bouldering also has a number of grading systems: Hueco[?] V grades, Fontainebleau technical grades and route colours and overall difficulty grades, Peak District B grades, British technical grades.

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Quadratic formula

... x to the quadratic equation <math>ax^2+bx+c=0</math> in terms of the coefficients a, b and c, which are assumed to be real (but see below fo ...