Mathematical operations in Survo: 1 = Editorial computing 2 = Touch mode 3 = Matrix operations 4 = Analytical derivatives 5 = Operations on polynomials (Roots of algebraic equations) 6 = Linear programming (SIMPLEX) 7 = Listing of combinations, permutations, etc. (COMB) 8 = Finding integer relations between real numbers (INTREL) 9 = Markov chains C = Continued fractions (/CONTFRAC) G = Geometric constructions and their accuracy (GEOM) E = More information on the Survo Editor