%0 Journal Article %T Mathematical characterization of functions underlying the principle of relativity %A Sebastiano Pennisi %A Massimo Trovato %J Le Matematiche %D 1989 %I University of Catania %X In a Minkowsky space V, complete representation formulae are derived for scalar-valued, vector valued and tensor-valued sunctions subjected to the principle of relativity with an arbitrary number of scalars, vectors and tensors (of the second order symmetric and skewsymmetric) as variables. %U http://www.dmi.unict.it/ojs/index.php/lematematiche/article/view/681