> -----Original Message----- > From: Programming [mailto:[email protected]] > On Behalf Of 'Mike Day' via Programming > Sent: dinsdag 27 februari 2018 11:31 > To: [email protected] > Subject: Re: [Jprogramming] Separating digits > (....) > You might remember David Singmaster flogging the idea in his essays on the > Rubik cube, years ago; he called turn sequences such as R U^_1 L U R^_1 > commutators (I think!) > > J might code such an operation as L&.U&.(R^:_1) . >
AFAICS, within Rubik's cube theory, U^_1 L U is called a conjugate, so R U^_1 L U R^_1 is a double conjugate, whereas commutators are of the form R^_1 U^_1 R U. R.E. Boss ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
