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.
References
- Richardson, Daniel (1997). "How to recognize zero". Journal of Symbolic Computation 24 (6): pp. 627–645. doi:10.1006/jsco.1997.0157..
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