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Definition: the complex conjugate.
x := x0 + (-R x1)i.
Example: 3R+5Ri=3R+(-R5R)i.
Proposition: For every x in C, y in C, z in C, the following holds:
x = x, x+y = x + y, x*y = x * y, y != 0 => x/y = x / y,