Elementary number

An elementary number is one formalization of the concept of a closed-form number. The elementary numbers form an algebraically closed field containing the roots of arbitrary equations using field operations, exponentiation, and logarithms. The set of the elementary numbers is subdivided into the explicit elementary numbers and the implicit elementary numbers.

References[]

Ritt, Joseph Fels (1948). Integration in finite terms. Liouville's theory of elementary methods. New York: Columbia University press. p. 60.
Lin, Ferng-Ching (1983). "Schanuel's conjecture implies Ritt's conjectures". Chin. J. Math. 11 (1): 41–50.
Chow, Timothy (1999). "What is a closed-form number". Amer. Math. Monthly. 106 (5): 440–448.
Richardson, Daniel (1997). "How to recognize zero". Journal of Symbolic Computation. 24 (6): 627–645. doi:10.1006/jsco.1997.0157.

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