the part b of a complex number c = a + jb NOTE 1 - The imaginary part of a complex number c is denoted by Im c or by c''. NOTE 2 - The concept of imaginary part may be applied to a complex scalar, vector or tensor quantity or to a matrix of complex elements.
[n] - the part of a complex number that has the square root of -1 as a factor
The imaginary part of a complex number x+iy where x and y are real is y. See also: Complex Numbers.
the coefficient b in the complex number a + bi. Cf. real part.