[GiNaC-devel] [offtopic] Quaternions

[Alexei Sheplyakov]

On Wed, Feb 16, 2011 at 07:34:55AM -0600, Stephen Montgomery-Smith wrote:

>>> Non-commutative complex numbers? What's that?
>> sorry, I am a mechanical engineer :-)
> 
> Quaternions.

Also known as (3-dimensional spin 1/2) spinors. I think calling them
'complex numbers' is a bit confusing.

> Invented by Hamilton

Re-invented by Ehrenfest, Pauli, Dirac, and others. Extensively used in 
quantum mechanics.

Best regards,
	Alexei