content_image/868673.jpg content_image/868674.jpg content_image/868675.jpg content_image/868676.jpg
To take a simple example, assume we wish to compute with complex numbers of the form a ; ::1 i, where a and b are real numbers and i is the square root of -1. Thl're is no predefined type "complex." However, we can easily define il record type to represent complex numbers. This record would need two fields, both oftype Real, for the real and imaginary parts. The Syll tax necessary to express this is: 

<img src='content_image/868673.jpg'>

<img src='content_image/868674.jpg'>

<img src='content_image/868675.jpg'>

<img src='content_image/868676.jpg'>

