irrational expression
Mathematics term for an expression containing an irrational number, such as a root that cannot be simplified to a rational number.
In calculations with irrational expressions, rationalizing the denominator is often necessary.
An expression containing √2 is an example of an irrational expression.
無理数 is an irrational number, while 無理式 is an expression containing such numbers.
Compound of 無理 (irrational) + 式 (expression). The term is a direct calque from Western mathematical terminology.