Biorxiv Org In Mathematica tongue x^2 y^2 = 1 is pronounced as x^2 y^2 == 1 x^2y^2=1 It is a hyperbola, WolframAlpha is verry helpfull for first findings, The Documentation Center (hit F1) is helpfull as well, see Function Visualization, Plot3D x^2 y^2 == 1, {x, 5, 5}, {y, 5, 5}% Plotting results surf (p,vol,t) v = R*t/p; Plot x2 (y-^x)2=1 nima