Complex

lastmod 2019-02-25created 2014-09-033 edits

In mathematics, a complex number (複素數, complex number) is a number that can be expressed in the following form.

a + bi

Here a and b are real numbers, and i is the imaginary unit satisfying i²=-1.

Operations

• Addition: (a + bi) + (c + di) = (a + c) + (b + d)i
• Subtraction: (a + bi) - (c + di) = (a - c) + (b - d)i
• Multiplication: (a + bi) * (c + di) = ac + bci + adi + bd i^2 = (ac - bd) + (bc + ad)i

Favorite site

• Wikipedia (en) Description of complex numbers
• Wikipedia (ko) Description of complex numbers

Programming

• complex class template - 20.1 Overview