arXiv:1309.2921v1 [hep-th] 11 Sep 2013 WIS/10/13 SEP-DPPA On Scale and Conformal Invariance in Four Dimensions Anatoly Dymarsky,a Zohar Komargodski,b Adam Schwimmer,b and Stefan Theisen c a DAMTP, University of Cambridge, Cambridge, CB3 0WA, UK b Weizmann Institute of Science, Rehovot 76100, Israel c Max-Planck-Institut fu¨r Gravitationsphysik, Albert-Einstein-Institut, 14476 Golm, Germany

Only Commutators Have Trace Zero - People If Trace(Z) = 0 then Z is a commutator. Proof 3: The theorem is obviously valid if Z is 1-by-1 or a bigger zero matrix. Therefore assume that Z is a nonzero square matrix of dimension bigger than 1 . Our proof goes by induction; we assume the desired inference valid for … Multilinear polynomials of small degree evaluated on May 01, 2016

## We now make some remarks about related work. A method for solving the Cauchy problem for decaying initial data for integrable evolution equations in one spatial variable was disco

by iwill turn a hermitean matrix into a hermitean one. Watch for these little factors of i, they will cause much grief otherwise! 4.4.3 Hermitean matrices do not form a Lie algebra with respect to the commutator: the commutator of two hermitean matrices is anti-hermitean. 4.5 The most general traceless hermitean matrix is a b 1 +ib 2 b 1 −ib

### I'll assume a square matrix with real entries in my answer. 1) A matrix with trace zero has both positive and negative eigenvalues, except if the matrix is the zero matrix. This is because the trace of a matrix is equal to the sum of its eigenva

Aug 31, 2016