Hypertranscendental number

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A complex number is said to be hypertranscendental if it is not the value at an algebraic point of a function which is the solution of an algebraic differential equation with coefficients in Z[r] and with algebraic initial conditions.

The term was introduced by Mordukhai-Boltovski in "Hypertranscendental numbers and hypertranscendental functions" (1949).

The term is related to transcendental numbers, which are numbers which are not a solution of a non-zero polynomial equation with rational coefficients. The number e is transcendental but not hypertranscendental, as it can be generated from the solution to the differential equation y' = y.

Any hypertranscendental number is also a transcendental number.

[edit] See also

• Hypertranscendental function

[edit] References

• Mordukhai-Boltovski, "Hypertranscendental numbers and hypertranscendental functions", Dokl. Akad. Nauk. SSSR, 64 (1949)

• Hiroshi Umemura, "On a class of numbers generated by differential equations related with algebraic groups", Nagoya Math. Journal. Volume 133 (1994), 1-55. (Downloadable from ProjectEuclid)