of: a complex number (where and are real numbers)
is: the term [M1.4, M3.1, P5.5]
often is denoted: by [M3.1, P5.5]
Copyright 1997, The Open University
(where 
and 
are real numbers)
(where and are real numbers)
[M1.4, M3.1, P5.5]
[M3.1, P5.5]
