IN defining the forms and dimensions of solids by means of scale drawings, a very useful method in certain cases is that of metric projection whereby three systems of parallel edges of the solid are ...

It is shown that a two-level orthogonal array with strength three whose run size is not a multiple of 16 has the hidden projection property that in its projection on to any five factors, all the main ...

We prove that if two convex bodies K, L ⊂ ℝ3 satisfy the property that the orthogonal projections of K and L onto every plane containing the origin are rotations of each other, then either K and L ...