MathDB
TOT 012 1981 Spring S1 8 tetrahedra touch each other by faces

Source:

August 17, 2019
tetrahedron3D geometrygeometry

Problem Statement

We will say that two pyramids touch each other by faces if they have no common interior points and if the intersection of a face of one of them with a face of the other is either a triangle or a polygon. Is it possible to place 88 tetrahedra in such a way that every two of them touch each other by faces?
(A Andjans, Riga)