Niels Henrik Abel Quotes
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Niels Henrik Abel, Philip Horowitz (2007). “Abel on analysis: papers of N.H. Abel on Abelian and elliptic functions and the theory of series”
Letter to Professor Christoffer Hansteen (1826) "Oeuvres Complètes de N. H. Abel", mathematician, Nouvelle edition (1881) ed., Peter Ludwig Mejdell Sylow & Sophus Lie, Vol. 2, pp. 263-265, as quoted by Øystein Ore, "Niels Henrik Abel: Mathematician Extraordinary", p. 113, 1957.
"A Source Book in Mathematics". Book edited by David Eugene Smith, "A Memoir on Algebraic Equations, Proving the Impossibility of a Solution of the General Equation of the Fifth Degree" (1824), 1929.
Niels Henrik Abel, Olav Arnfinn Laudal, Ragni Piene (2004). “The Legacy of Niels Henrik Abel: The Abel Bicentennial, Oslo, June 3-8, 2002”, p.353, Springer Science & Business Media