Particle structure without mass (tempory page) 

Inverting the CLF equation and adding the
result to Einstein's equation gives:
E2r This can also be written as:
Eλ I will lay this out in detail when time permits me to do so but, for the mathematician, this should be sufficient to see that particle structure can be explained without resorting to any of the various methods of explaining mass. Thus the uncertainty of what mass is, can be avoided in defining particle structure. 