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 may be put in conic form. A set has this property if it is star-shaped around every point. Smooth functions with this property have a positive semi-definite Hessian and satisfy (*) Jensen’s inequality. Any two points in a set (10[1])with this property may be connected by a line segment entirely contained in the set, (10[1])and adding all such lines to the set (-5[1])generates this property’s namesake (10[1])“hull.” A function locally has this property where its second derivative is positive. For 10 points, name this property of polygons (10[1])whose internal angles are less than 180 degrees, contrasted with concave. ■END■ (10[1])