Based on a Morse-Smale structure we study planar global attractors Af of the scalar reaction-advection-diffusion equation ut = uxx + f(x, u, ux) in one space dimension. We assume Neumann boundary conditions on the unit interval, dissipativeness of f , and hyperbolicity of equilibria. We call Af Sturm attractor because our results strongly rely on nonlinear nodal properties of Sturm type. The pl...

The construction of Bell inequalities based on Platonic and Archimedean solids (Quantum 4 (2020), 293) is generalized to the case orbits generated by action some finite groups. A number examples with considerable violation presented.

In this essay, I explain and clarify Jacob Klein’s significant yet difficult account of how to read a Platonic dialogue. argue that Klein takes Plato’s dialogues be discursively incomplete dramas the audience is asked make whole by its participation. A dialogue thus comes into being only when readers or auditors examine arguments themselves.