irrational number

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Related to Irrational numbers: Imaginary numbers

irrational number

A real number that cannot be expressed as a ratio between two integers.

irrational number

(Mathematics) any real number that cannot be expressed as the ratio of two integers, such as π

irra′tional num′ber

a number that cannot be exactly expressed as a ratio of two integers.

ir·ra·tion·al number

A real number that cannot be expressed as a ratio between two integers. If written in decimal notation, an irrational number would have an infinite number of digits to the right of the decimal point, without repetition. Pi and the square root of 2 (√2) are irrational numbers.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.irrational number - a real number that cannot be expressed as a rational number
real, real number - any rational or irrational number
transcendental number - an irrational number that is not algebraic
algebraic number - root of an algebraic equation with rational coefficients
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References in periodicals archive ?
Drawing on a variety of genres for examples, each chapter explains musical topics first, such as rhythm, music theory, sound, tuning and temperament, musical group theory, change ringing, 12-tone music, and modern mathematical music by Steve Reich, Peter Maxwell Davies, and Iannis Xenakis, then related math concepts like geometric series and sequences, fractions, rational and irrational numbers, and multiplication tables.
It would be appropriate to use irrational numbers in figuring this out.
These three chapters provide a quick introduction to algebra, sufficient to exhibit irrational numbers or to gain a taste of cryptography.
The Year 8 achievement standard (ACARA, 2014) includes the following: "They [students] describe rational and irrational numbers .
Since ancient times, the concept of irrational numbers (any real number that cannot be expressed as a fraction a/b, where a is an integer and b is a non-zero integer) has fascinated mathematicians and students alike.
The ancient Pythagoreans tried to prevent irrational numbers from coming out of "concealment.
r [member of] Q*, where Q- is set of irrational numbers, resonance is impossible.
369): "This rule also works for irrational numbers of similar type like 2[square root to 2]/3, 3[square root to 2]/3 etc.
Niven: Irrational Numbers, MAA, John Wiley & Sons, Inc.
Nine studies consider representing and defining irrational numbers, student use of Derive software in comprehending and making sense of definite integral and area concepts, perspectives by mathematicians on teaching and learning proof, case studies from a transition-to-proof course on referential and syntactic approaches to proving, infinite iterative processes and actual infinity, teaching assistants learning how students think, the knowledge base about teaching among teachers of calculus in higher education, modeling students' conceptions, and strategies for controlling the work in mathematics textbooks for introductory calculus.
As one pupil explained irrational numbers at the front of the class, the prince was seen to grimace as he battled with the concept.