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Theophylactus of Constantinople

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Theophylactus Lecapenus (d.956), son of Byzantine Emperor Romanus I, was installed by Emperor Constantine Porphyrogenitus as the Patriarch of Constantinople from 933 to 956.

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Quadratic formula

... 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 the discriminant of the ...