Irrational number, also known as infinite acyclic decimal, cannot be written as the ratio of two integers. If written in decimal form, there are infinitely many digits after the decimal point, which will not cycle.

Common irrational numbers include the square root, π and E (the latter two are transcendental numbers) of incomplete square numbers. Another feature of irrational numbers is the expression of infinite connected fractions. Irrational numbers were first discovered by a disciple of Pythagoras.

Related examples

(1) Pi in the Greek alphabet? π (pronounced pài) is a constant (approximately equal to 3. 14 1592654), which is the ratio of circumference to diameter. It is an irrational number, that is, an infinite cycle decimal.

(2) As a mathematical constant, E is the basis of natural logarithmic function. Sometimes called Euler number, named after the Swiss mathematician Euler; There is also a rare name, Napier constant, to commemorate the Scottish mathematician John Napier? (John Napier) introduced logarithm.