We analyse Coleman’s theorem asserting the absence Goldstone bosons and spontaneously broken continuous symmetry in the quantum field theory of a free massless (pseudo)scalar field in 1+1–dimensional space–time (Comm. Math. Phys. 31, 259 (1973)). We confirm that Coleman’s theorem reproduces well–known Wightman’s statement about the non–existence of a quantum field theory of a free massless (pse...

Within one tradition of Western thought, politics and the arts have been categorized as distinct and separate entities. So when aesthetics is under discussion, political concern is often dismissed as dogmatic, ephemeral, or partial, and when politics is of chief interest, aesthetics is swept aside as immaterial, insubstantial, or obscure. The way literature has been defined and categorized in t...

When analyzing database query languages a property of theories, the pseudo-finite homogeneity property has been introduced and applied (cf. [3]). We show that a stable theory has the pseudo-finite homogeneity property just in case its expressive power for finite states is bounded. Moreover, we introduce the corresponding pseudo-finite saturation property and show that a theory fails to have the...

A pseudo-triangle is a simple polygon with exactly three convex vertices, and a pseudo-triangulation is a face-to-face tiling of a planar region into pseudo-triangles. Pseudo-triangulations appear as data structures in computational geometry, as planar bar-and-joint frameworks in rigidity theory and as projections of locally convex surfaces. This survey of current literature includes combinator...