The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » sci.math.* » sci.math

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: Euclidean algorithm and Turk's head knots
Replies: 2   Last Post: Nov 24, 2012 8:25 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]

Posts: 28
Registered: 11/24/12
Euclidean algorithm and Turk's head knots
Posted: Nov 24, 2012 6:54 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

There is sometimes a need to generate one strand THK knots, of which
two characteristic parameters (leads and bights) must be relatively first: 's_head_knot#Leads_and_bights

The ancient Romans knew these knots. For example traced mosaic:
(Roman Theatre in Bosra, Syria, built in the second quarter of the 2nd century )

Interestingly, by manipulating this knot we can find a reduction algorithm
in a natural way.
Surprisingly, it's nothing else but Euclidean algorithm :-)
It's possible so that Euclide discovered his algorithm by reducing leads (L)
and bights (B) in THK.

Observing problem for the case of a more general multi-strand
(for example 3 strand (S)).

This knot THK has 6 bights (B) , 9 leads (L) and 3 strands (S)
(separate thread):

You can reduce it, without changing the amount of strands,
Using the Euclidean algorithm for the number of B and L.

The reduced knot has 6 B, (9-6) = 3 L and S 3 separate thread:

We can reduce further without changing the amount of S.
(6-3) = 3 B, 3 L, and 3 separate S:

Next step is impossible, we have reached the minimum.

You can get to the algorithm yourself by cutting the knots THK.
This is here:

Perhaps Euclid had come up with the idea of their algorithm in the same way
as I showed you?

I have used the Euclidean algorithm in generating these diagrams:
Then I noticed that they are topologically similar to an ,occurring in many forms, ancient mosaics.
There were probably used logarithmic spirals, and I applied the arithmetic spirals.
Then it turned out that Leonardo da Vinci had a similar idea.
Here is a copy of the emblem by the master Durer himself :

What do you think about my hypothesis about Euclid's algorithm?

Regards, Ciekaw

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.