Let us give an idea of the notation used in Viete is book Zetetiques [Introduction to the Analytic Art ](1591),the expression F·H+F·B D+F 二E is written {} aequabitur E. Viete's notation for powers of the unknown is very heavy:he writes "A quadratum”forA2,“A cubus'”forA3,“A quadrato--quadratum”forA4, etc,and“A potestas,.”“A gradum"for Am,A". 3Let us give an idea of the notation used in Vi`ete is book Z´et´etiques [Introduction to the Analytic Art ](1591), the expression F · H + F · B D + F = E is written    F in H +F in B D + F    æquabitur E. Vi`ete’s notation for powers of the unknown is very heavy: he writes “A quadratum” for A2 , “A cubus” for A3 , “A quadrato-quadratum” for A4 , etc., and “A potestas,” “A gradum” for Am, An. 3