Excel has over 475 formulas in its Functions Library, from simple mathematics to very complex statistical, logical, and engineering tasks such as IF statements (one of our perennial favorite stories); ...
Mathematics of Operations Research, Vol. 5, No. 1 (Feb., 1980), pp. 120-125 (6 pages) Necessary and sufficient conditions for convexity of lower semi-continuous quasiconvex functions are given. By ...