Mathematical.

Elementary crystallography Evans, John William 1924 Elementary mathematical economics Henry, S. G. B. 1969 Elementary mathematics in economics Dowsett, W. T. 1959 Elements of dynamic optimization Chiang, Alpha C. 1992 Elements of general equilibrium analysis edited by Alan Kirman 1998 Elements of linear programming Geary, Robert Charles 1973 Elements of optimization, with applications in economics and business Koo, Delia 1977 Essential mathematics for economic analysis Sydsæter, Knut 2016 Essential mathematics for economic analysis Sydsæter, Knut 2008 Essential mathematics for economic analysis Sydsæter, Knut 2002 Essential mathematics for economists Yamane, Taro 1968 Finance, economics and Mathematics Vasicek, Oldrich Alfons 2016 Fixed point theorems with applications to economics and game theory Border, Kim C. 1985 Fixed point theory in ordered sets and applications: from differential and integral equations to game theory Carl, S. 2011 Foundations of crystallography Julian, Maureen M. 2008 Foundations of economic analysis Samuelson, Paul A. 1983 Foundations of economic analysis Samuelson, Paul A. 1965 Fracture machanics: from theory practice Parton, V.Z. 1992 Frontiers of quantitative economics edited by Michael D. Intriligator 1971 Frontiers of quantitative economics Ed. by Michael D. Intriligator 1971