###### Answer: 2×2 – 4x – 6

Fri Nov 29 2002 13:30:00 GMT-0500 (Eastern Standard Time) · In topology knot theory is the study of mathematical knots.While inspired by knots which appear in daily life such as those in shoelaces and rope a mathematical knot differs in that the ends are joined together so that it cannot be undone the simplest knot being a ring (or “unknot”).In mathematical language a knot is an embedding of a circle in 3-dimensional Euclidean space (in topology …

In geometry a polyhedron (plural polyhedra or polyhedrons) is a three-dimensional shape with flat polygonal faces straight edges and sharp corners or vertices.The word polyhedron comes from the Classical Greek πολύεδρον as poly-(stem of πολύς “many”) + -hedron (form of ἕδρα “base” or “seat”).. A convex polyhedron is the convex hull of finitely many points not all on …

Translational invariance implies that at least in one direction the object is infinite: for any given point p the set of points with the same properties due to the translational symmetry form the infinite discrete set {p + na | n ∈ Z} = p + Z a.Fundamental domains are e.g. H + [0 1] a for any hyperplane H for whi…