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6 papers · 1 filter
How is a Chordal Graph like a Supersolvable Binary Matroid?
Raul Cordovil, David Forge, Sulamita Klein
Let G be a finite simple graph. From the pioneering work of R. P. Stanley it is known that the cycle matroid of G is supersolvable iff G is chordal (rigid): this is another way to…
Semi-free Hamiltonian circle actions on 6 dimensional symplectic manifolds
Hui Li
Assume is a connected, compact 6 dimensional symplectic manifold equipped with a semi-free Hamiltonian circle action, such that the fixed point set consists of isolated po…
Deduction of Lorentz Transformation from the existence of absolute rest. Deduction of the speed of light in any frame of reference
Rodrigo de Abreu
We begin by admitting the following: (i) there is a frame of reference where the speed of light is the same in any direction (that speed is c) (ii) the average speed of light on a…
K-theory for Cuntz-Krieger algebras arising from real quadratic maps
Nuno Martins, Ricardo Severino, J. Sousa Ramos
We compute the -groups for the Cuntz-Krieger algebras , where is the Markov transition matrix arising from the \textit…
The First Principle of Thermodynamics and the Non-Separability of the Quantities "Work" and "Heat": The adiabatic piston controversy
Rodrigo de Abreu
The impossibility of separating into work and heat the energy transmitted between two subsystems through a movable piston is analyzed in this article. The process here described, a…
CP Violation and the Search for New Physics
G. C. Branco
We present an overview of CP violation in the Standard Model and Beyond, describing various possible sources of CP violation and how to search for them.