Overview

Nigel Crouch's OPPOSITE CORNERS maths schtick
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The idea is to have a grid with numbers on it, the first one being
like this:

1	2	3	4
5	6	7	8
9	10	11	12
13	14	15	16
17	18	19	20
21	22	23	24

The application you are designing should be able to display a user-
defined grid size, and draw a square around a user-defined even set
of numbers, then multiply the top-left with the bottom-right, and the
bottom-left with the top-right.  Bah! See that ol' bit o' paper anyway.

Copyright 1997, Abbott & Palmer Corporation, all rights reserved.