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David Stevenson

David Stephenson (1815-1886) was a lighthouse designer, the son of Robert Stevenson[?], brother of Alan Stevenson[?] and Thomas Stevenson[?], and uncle to Robert Louis Stevenson.

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... are also called the roots of the equation. The formula reads <math> x=\frac{-b \pm \sqrt {b^2-4ac}}{2a} </math> The term b2 – 4ac is called ...