%0 Journal Article %T Quadratical groupoids %J - %D 1993 %R DOI Code: 10.1285/i15900932v13n1p107 %X A groupoid is said to be quadratical if the identity (1) holds and if is a right quasigroup, i.e. for any the equation has the unique solution x. Quadratical groupoids arose originally from the geometric situation described in Example 3 below.In this paper we study abstract quadratical groupoids and certain derived algebraic structures %U http://siba-ese.unisalento.it/index.php/notemat/article/view/1305