=—6~ vpyvvPP~ and the tensor (sL'~ v sE p vppppp 5p~ devised by Calogero However, if
now some interaction is envisaged, the above considerations must be further ap-plied to …

IT has recently been shown that the set of states for three noninteracting and nonrelativistic
spinless particles can be put into a one-to-one correspondence with the set of irreducible …

I r YI= P3a'b y2= P3&bbb y3= p3o'gb y4=—zpgb(14) forming a pseudovector. 6 If we again
represent P by four functions of X „and r „, we can deduce from {11) and (12) by taking …

One of the outstanding problems of elementary-particle physics is the problem of combining
Lorentz invariance and internal symmetry in a nontrivial way. In this paper we attack this …

I. Introduction.—The recent successful ap-plication of the symmetry group SU (6) has
opened the floodgatesof speculation. The original for-mulation of SU (6) …

In the recent period various authors (~-4) have investigated the possibility of interpreting the
isotopic-spin space as reflecting (~ real internal motions~ in Minkowski space. From external …

Usually,, anti-symmetrical commutation relations a1e adopted for the different· kinds of.
spinor fields, In the case· of commutation relations of (+)-type between two different Fermi …

Comments are presented on the work of Gulrsey on the" Group Structure of Elementary
Particles." These concern the relationships of spin and iso-spin and the reasonableness of …

The criteria of validity of this theory are, among others, the nonrelativistic approximation, the
classical approximation which gives the Thomas spin theory, and the values of the energy in …

Recently it was proposed by Gursey and Radi-cati'and Pais that the SU (6) symmetry
scheme incorporating spin and unitary spin may have important consequences in particle …