The SIR(D) epidemiological model is defined through a system of transcendental equations, not solvable by elementary functions. In the present paper those equations are successfully replaced approximate ones, whose solutions given explicitly in terms functions, originating, piece-wisely, from generalized logistic functions: they ensure exact (in numerical sense) asymptotic values, besides to be...

The mixed quantum rabi model is generated based on the interaction of single photon and two photon. Based mix QRM under one-qubit, this paper extended it to two-qubit Hamiltonian solve it, then analyzed variation law different parameter variables symmetry matrix.