For any complex numbers z and w you can find the sum
z+w by attaching the vector w to the tip of the
vector z and completing a paralellogram. The diagonal of that
paralellogram is the vector z+w.

To find the difference z-w, reverse the vector w and
find z+(-w).

Context

You can easily verify this by writing z and w as
vectors in R^{2}.

Adding vectors z and w

Subtracting vectors z and w

Interactive Complex Analysis, ver. 1.0.0 (c) 2006-2007, Bert G. Wachsmuth Page last modified: May 29, 2007