Transcendental number (nonfiction)

In mathematics, a transcendental number is a real or complex number that is not algebraic — that is, it is not a root of a nonzero polynomial equation with integer (or, equivalently, rational) coefficients.

The best-known transcendental numbers are π and e.

Though only a few classes of transcendental numbers are known (in part because it can be extremely difficult to show that a given number is transcendental), transcendental numbers are not rare. Indeed, almost all real and complex numbers are transcendental, since the algebraic numbers are countable while the sets of real and complex numbers are both uncountable.

All real transcendental numbers are irrational, since all rational numbers are algebraic.

The converse is not true: not all irrational numbers are transcendental; e.g., the square root of 2 is irrational but not a transcendental number, since it is a solution of the polynomial equation x2 − 2 = 0.

Another irrational number that is not transcendental is the golden ratio, since it is a solution of the polynomial equation x2 − x − 1 = 0.

Fiction cross-reference

• Crimes against mathematical constants
• Mathematics

Nonfiction cross-reference

• Algebraic number (nonfiction)
• Complex number (nonfiction)
• e (nonfiction)
• Mathematics (nonfiction)
• Number (nonfiction)
• Pi (nonfiction)

External links:

• Complex number @ Wikipedia