A number that cannot be expressed as the ratio of two integers is known as an irrational number.
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They are real numbers that cannot be expressed as a ratio of two integers.
An irrational number is one that cannot be expressed as a ratio of two integers.
Any real number which cannot be expressed as a ratio of two integers is an irrational number.
Any number that can be expressed as the ratio of two integers is a rational number.
A rational number is a real number that can be expressed as a ratio of two integers; an irrational number cannot be so expressed.