The quadratic formula made hard: A less radical approach to solving equations

Details The quadratic formula made hard: A less radical approach to solving equations The quadratic formula made hard: A less radical approach to solving equations

1994-11-16

arxiv.org/abs/math/9411224v1

Mathematics

Classical Analysis and ODEs

Scientific paper

It appears that, along with many of my friends and colleagues, I had been brainwashed by the great and tragic lives of Abel and Galois to believe that no general formulas are possible for roots of equations higher than quartic. This seemed to be confirmed by the brilliant and arduous solution of the general quintic by Hermite. Yet, below we find a formula giving a root to any algebraic equation of degree 2-5 and any reduced equation (see below) of higher degree. This algorithm, which must have been familiar to Lagrange, resulted when I was working on a paper on the asymptotics of hypergeometric functions where Gauss' multiplication formula for the gamma function is used to reduce certain infinite series, and by a happy accident my copy of Whittaker and Watson opened at p. 133.

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