6 citations · 6 across the 4 of their papers we have counts for
5 papers
Exact solution for a quantum SIR model
Márcia Lemos-Silva, Sandra Vaz, Delfim F. M. Torres
Based on the classical continuous system initially proposed by Bailey in 1975, we present a novel Susceptible--Infected--Removed (SIR) model defined in quantum time, where the temp…
The Omega Calculus of Variations
Márcia Lemos-Silva, Delfim F. M. Torres
We prove a necessary optimality condition of Euler--Lagrange type for the calculus of variations with Omega derivatives, which turns out to be sufficient under jointly convexity of…
Stability analysis and optimal control of the logistic equation
Márcia Lemos-Silva, Sandra Vaz, Delfim F. M. Torres
We consider the unexploited/exploited logistic equation and study the stability of equilibrium points through Lyapunov functions. Then, we apply first and second order optimality c…
Alternative views on fuzzy numbers and their application to fuzzy differential equations
Akbar H. Borzabadi, Mohammad Heidari, Delfim F. M. Torres
We consider fuzzy valued functions from two parametric representations of -level sets. New concepts are introduced and compared with available notions. Following the two propose…
Modelling the dynamics of online food delivery services on the spread of food-borne diseases
Emmanuel Addai, Delfim F. M. Torres, Zalia Abdul-Hamid +2
We propose and analyze a deterministic mathematical model for the transmission of food-borne diseases in a population consisting of humans and flies. We employ the Caputo operator…