Hi Sean, Nice link! Here's another for Syed (that defers the 'real life' usefulness to Engineering 201) but still shows some of the usefulness of complex numbers for analyzing and graphing polynomials: http://www.purplemath.com/modules/complex.htm HTH, RonL. (Who's a little disappointed not to have turned up any 'meta-mathematic' links pointing to the importance of abstract mathematics in constructing conceptual frameworks ... laying the mental groundwork for the perceptions and discoveries that come later.) -----Original Message----- From: Sean [mailto:ethanol at mathlab.sunysb.edu] http://www.math.toronto.edu/mathnet/questionCorner/complexinlife.html -----Original Message----- Hello Everybody, Can somebody tell me that what are the practical uses of Complex Numbers (Mathematics)? Thank you, Syed Zeeshan Haider.