Consider a d-dimensional closed ball B whose center coincides with that of the hypercube [0, 1]d. Pick radius in such way vertices are outside and midpoints its edges interior B. It is known that, when d ≥ 3, (d − 1)-dimensional volume H∩[0, 1]d, where H hyperplane ℝd tangent to B, largest possible if only orthogonal diagonal hypercube. shown here same holds 5 but required contain centers squar...