Emperor Go-Uda (後宇多天皇) was the 91st imperial ruler of Japan. His lineage is called Daikakuji-tō (大覚寺統), in contrast to Jimyōin-tō (持明院統), the line of Emperor Fushimi.
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If the discriminant is zero, then there is a repeated solution x, and this solution is real. (Geometrically, this means that the parabola ...