Quer·mass·integrals define mixed volumes of sets with this property via Steiner’s formula. A Fréchet space is a topological vector space that locally has this property. If the objective function and feasible region both have this property, a program (15[1])may be put in conic form. A set (15[1])has this property if it is star-shaped around every point. Smooth functions with this property (-5[1])have a positive (-5[1])semi-definite Hessian and satisfy (*) Jensen’s inequality. (10[4])Any two points in a set with this property may be connected by a line segment entirely (10[1])contained in the set, and adding (-5[1])all such lines to the set generates this property’s namesake “hull.” A function locally has this property where its second derivative is positive. For 10 points, name this property of polygons whose internal angles are less than 180 degrees, (10[1])contrasted with concave. ■END■ (10[1])