by **4sigma** » August 21st, 2006, 10:20 am

[img]http://img301.imageshack.us/img301/4923/fifthvb9.png[/img]

In general, you can divide the paper into N+1 parts by:

1) Dividing it into N parts along the left edge

2) Making a crease from the bottom right corner to a distance 1/N up the left edge

3) Making the diagonal crease from the bottom left to the top right.

4) The point where these two creases intersect is a distance of 1/(N+1) from both the left and bottom edges.

Algebraicaly you can prove this because the creases form the lines y=x and y= (1 - x)/N. These intersect at the point {1/(N+1), 1/(N+1)}.

Tissue foil -- the best thing since sliced bread.