👉 Untranscendental is a mathematical term that refers to a number or expression that cannot be expressed as a simple fraction, decimal, or other rational number. It is also known as transcendental or irrational. In mathematics, an irrational number is any real number that cannot be expressed exactly in the form of a ratio of two integers. For example, pi (π), e (the base of the natural logarithm) and 2 are all examples of irrational numbers. They are not rational numbers