Operators class 1 have thin spaces around them. LaTeX formats mathematics the way its done in mathematics texts. Spacing in Math Mode.
Space is measured in math units or mu.
LATEX Mathematical Symbols The more unusual symbols are not deļ¬ned in base LATEX NFSS and require usepackageamssymb 1 Greek and Hebrew letters a alpha k kappa ps psi z digamma Delta TH Theta v beta l lambda r rho e varepsilon G Gamma Y Upsilon. 418 of quad 4 mu. Spacing in Math Mode. Lnex x wrong by convention lnex x.