irrational number

number that cannot be expressed as the ratio of two whole numbers (Mathematics)

numbers that cannot be represented as a ratio of two integers (Mathematics)

In mathematics, an irrational number is any real number that is not a rational number — that is, it is a number which cannot be expressed as a fraction m/n, where m and n are integers, with n non-zero. Informally, this means numbers that cannot be represented as simple fractions. It can be deduced that they also cannot be represented as terminating or repeating decimals, but the idea is more profound than that. While it may seem strange at first hearing, almost all real numbers are irrational, in a sense which is defined more precisely below.
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Noun
1. a real number that cannot be expressed as a rational number
(hypernym) real number, real
(hyponym) transcendental number

<mathematics> A real number which is not a rational number, i.e. it is not the ratio of two integers.
The decimal expansion of an irrational is infinite but does not end in an infinite repeating sequence of digits.
Examples of irrational numbers are pi, e and the square root of two.
(1995-04-12)

n. จำนวนอตรรกยะ, จำนวนที่ไม่ลงตัว