Neusis constructions (3): the regular heptagon

Constructing a regular heptagon is a very elegant and delightful exercise in geometry and algebra, and which requires the trisection of an angle.  There are plenty of discussions all over the web but mine, which is available at Numbers and

Neusis constructions (3): the regular heptagon

Constructing a regular heptagon is a very elegant and delightful exercise in geometry and algebra, and which requires the trisection of an angle.  There are plenty of discussions all over the web but mine, which is available at Numbers and

Neusis constructions (2): trisections

This post, containing a nice slew of methods of trisecting a general angle using neusis methods, can be found at Numbers and Shapes.

Neusis constructions (2): trisections

This post, containing a nice slew of methods of trisecting a general angle using neusis methods, can be found at Numbers and Shapes.

Neusis constructions (1)

You can find this post, introducing geometric constructions which allow the use of a straight-edge with two marks, at my new site Numbers and Shapes.

Neusis constructions (1)

You can find this post, introducing geometric constructions which allow the use of a straight-edge with two marks, at my new site Numbers and Shapes.

Solving a cubic by folding

This post, which is on my new site here: http://www.numbersandshapes.net/?p=2520 shows how a cubic equation can be solved by origami.  This is not a new result by any means, but it’s hard to find a simple proof of how the

Solving a cubic by folding

This post, which is on my new site here: http://www.numbersandshapes.net/?p=2520 shows how a cubic equation can be solved by origami.  This is not a new result by any means, but it’s hard to find a simple proof of how the

The foolishness of signature images

As I explained on the page Numbers and Shapes, this blog is moving to a new home, and you’ll find this post there: The foolishness of signature images Enjoy!

The foolishness of signature images

As I explained on the page Numbers and Shapes, this blog is moving to a new home, and you’ll find this post there: The foolishness of signature images Enjoy!

An afternoon with Conrad Wolfram

Astute readers will notice that it’s been a very long time (five months!) since my last post. This is because I’ve been on sabbatical for this time, and not teaching. While this has been a wonderful opportunity to get to

An afternoon with Conrad Wolfram

Astute readers will notice that it’s been a very long time (five months!) since my last post. This is because I’ve been on sabbatical for this time, and not teaching. While this has been a wonderful opportunity to get to