frac(x) represents the “fractional part” x-floor(x) of the number x.

For complex arguments, frac is applied separately to the real and imaginary part.

For real numbers, the value x-floor(x) represented by frac(x) is a number from the interval . For positive arguments, you may think of frac as truncating all digits before the decimal point.

For integer arguments, 0 is returned. For rational arguments, a rational number is returned. For arguments that contain symbolic identifiers, symbolic function calls are returned. For floating-point arguments or non-rational exact expressions, floating-point values are returned.

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