Skip over navigation
A good start is to make the knots you can see on the problem page.
The Invertible Trefoil
Age 14 to 16
Challenge Level 
A good start is to make the knots you can see on the problem page.
The thicker the string the easier it is to see the 'shape' of the knot.
Rope is very good, and a tube length can be joined to make a complete circuit.
This is good new mathematics so be prepared to invest a bit of time getting equipped so you can enjoy exploring these ideas.Related Collections
You may also like
Links and Knots
Some puzzles requiring no knowledge of knot theory, just a careful inspection of the patterns. A glimpse of the classification of knots, prime knots, crossing numbers and knot arithmetic.
The Bridges of Konigsberg
Investigate how networks can be used to solve a problem for the 18th Century inhabitants of Konigsberg.
A Curious Collection of Bridges
Read about the problem that tickled Euler's curiosity and led to a new branch of mathematics!