%0 Journal Article %T <i>D</i> Dimensions and <i>N</i> × <i>N</i> Matrix Representations of Fermions %A Doron Kwiat %J Journal of High Energy Physics, Gravitation and Cosmology %P 635-641 %@ 2380-4335 %D 2022 %I Scientific Research Publishing %R 10.4236/jhepgc.2022.83045 %X The connection between the number of dimensions and the size of the representation matrices in the Dirac equation has been discussed thoroughly and the restriction N2 = 2D was derived. In this summary, the result is brought again, this time with emphasis on the importance of irreducibility of the representations. As a counter example, the case of the neutrino is discussed where the above restriction does not hold, indicating that the Dirac equation, in this case, is reducible. %K Fermions %K Dirac Equation %K < %K i> %K D< %K /i> %K -Dimensional Universe %K < %K i> %K N< %K /i> %K Dimensional Gamma Matrices %K Irreducible Representations %U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=118566