170 citations · 1.2k across the 54 of their papers we have counts for
54 papers
Maximum Entropy Least Squares Solutions of Overdetermined Linear Systems
Felice Iavernaro, Monica Lazzo, Lorenzo Pisani
We investigate the theoretical foundations of a recently introduced entropy-based formulation of weighted least squares for the approximation of overdetermined linear systems, moti…
A Multi-Order Extension of Fractional HBVMs (FHBVMs)
Luigi Brugnano, Gianmarco Gurioli, Felice Iavernaro +1
The efficient numerical solution of fractional differential equations has been recently tackled through the definition of Fractional HBVMs (FHBVMs), a class of Runge-Kutta type met…
High-order Gauss-Legendre methods admit a composition representation and a conjugate-symplectic counterpart
Felice Iavernaro, Francesca Mazzia, Ernst Hairer
One of the most classical pairs of symplectic and conjugate-symplectic schemes is given by the Midpoint method (the Gauss-Runge-Kutta method of order 2) and the Trapezoidal rule. T…
Analysis and implementation of collocation methods for fractional differential equations
Luigi Brugnano, Gianmarco Gurioli, Felice Iavernaro +1
Recently, the class of Runge-Kutta type methods named Fractional HBVMs (FHBVMs) has been introduced for the numerical solution of initial value problems of fractional differential…
On the use of the principle of maximum entropy to improve the robustness of bivariate spline least-squares approximation
Pierluigi Amodio, Luigi Brugnano, Felice Iavernaro
We consider fitting a bivariate spline regression model to data using a weighted least-squares cost function, with weights that sum to one to form a discrete probability distributi…
Does the fluid-static equilibrium of a self-gravitating isothermal sphere of van der Waals' gas present multiple solutions?
Domenico Giordano, Pierluigi Amodio, Felice Iavernaro +1
We take up the investigation we left in the future-work stack in Giordano \textit{et al.} [``Fluid statics of a self-gravitational isothermal sphere of van der Waals' gas,'' Phys.…
Solving FDE-IVPs by using Fractional HBVMs: some experiments with the fhbvm code
L. Brugnano, G. Gurioli, F. Iavernaro
In this paper we report a few numerical tests by using a slight extension of the Matlab code fhbvm in [8], implementing Fractional HBVMs, a recently introduced class of numerical m…
Numerical solution of FDE-IVPs by using Fractional HBVMs: the fhbvm code
Luigi Brugnano, Gianmarco Gurioli, Felice Iavernaro
In this paper we describe the efficient numerical implementation of Fractional HBVMs, a class of methods recently introduced for solving systems of fractional differential equation…
Fluid statics of a self-gravitating isothermal sphere of van der Waals' gas
Domenico Giordano, Pierluigi Amodio, Felice Iavernaro +3
We subject to scrutiny the physical consistency of adopting the perfect-gas thermodynamic model within self-gravitation circumstances by studying the fluid statics of a self-gravit…
A shooting-Newton procedure for solving fractional terminal value problems
Luigi Brugnano, Gianmarco Gurioli, Felice Iavernaro
In this paper we consider the numerical solution of fractional terminal value problems (FDE-TVPs). In particular, the proposed procedure uses a Newton-type iteration which is parti…
A spectrally accurate step-by-step method for the numerical solution of fractional differential equations
L. Brugnano, K. Burrage, P. Burrage +1
In this paper we consider the numerical solution of fractional differential equations. In particular, we study a step-by-step graded mesh procedure based on an expansion of the vec…
An entropy-based approach for a robust least squares spline approximation
Luigi Brugnano, Domenico Giordano, Felice Iavernaro +1
We consider the weighted least squares spline approximation of a noisy dataset. By interpreting the weights as a probability distribution, we maximize the associated entropy subjec…
A probabilistic approach to the twin prime and cousin prime conjectures
Daniele Bufalo, Michele Bufalo, Felice Iavernaro
We address the question of the infinitude of twin and cousin prime pairs from a probabilistic perspective. Our approach partitions the set of integer numbers greater than in fi…
A didactically motivated reexamination of a particle's quantum mechanics with square-well potentials
Domenico Giordano, Pierluigi Amodio, Felice Iavernaro
We address two questions regarding square-well potentials from a didactic perspective. The first question concerns whether or not the justification of the standard a priori omissio…
(Spectral) Chebyshev collocation methods for solving differential equations
Pierluigi Amodio, Luigi Brugnano, Felice Iavernaro
Recently, the efficient numerical solution of Hamiltonian problems has been tackled by defining the class of energy-conserving Runge-Kutta methods named Hamiltonian Boundary Value…
Continuous-Stage Runge-Kutta approximation to Differential Problems
Pierluigi Amodio, Luigi Brugnano, Felice Iavernaro
In recent years, the efficient numerical solution of Hamiltonian problems has led to the definition of a class of energy-conserving Runge-Kutta methods named Hamiltonian Boundary V…
Arbitrary high-order methods for one-sided direct event location in discontinuous differential problems with nonlinear event function
Pierluigi Amodio, Luigi Brugnano, Felice Iavernaro
In this paper we are concerned with numerical methods for the one-sided event location in discontinuous differential problems, whose event function is nonlinear (in particular, of…
Arbitrarily high-order energy-conserving methods for Hamiltonian problems with quadratic holonomic constraints
P. Amodio, L. Brugnano, G. Frasca-Caccia +1
In this paper, we define arbitrarily high-order energy-conserving methods for Hamiltonian systems with quadratic holonomic constraints. The derivation of the methods is made within…
Arbitrarily high-order energy-conserving methods for Poisson problems
Pierluigi Amodio, Luigi Brugnano, Felice Iavernaro
In this paper we are concerned with energy-conserving methods for Poisson problems, which are effectively solved by defining a suitable generalization of HBVMs, a class of energy-c…
A new framework for polynomial approximation to differential equations
Luigi Brugnano, Gianluca Frasca-Caccia, Felice Iavernaro +1
In this paper we discuss a framework for the polynomial approximation to the solution of initial value problems for differential equations. The framework, initially devised for the…
Maximal-entropy driven determination of weights in least-square approximation
Domenico Giordano, Felice Iavernaro
We exploit the idea to use the maximal-entropy method, successfully tested in information theory and statistical thermodynamics, to determine approximating function's coefficients…
The hidden side of COVID-19 spread in Italy
Luigi Brugnano, Felice Iavernaro, Paolo Zanzottera
Background. The paper concerns the SARS-CoV2 (COVID-19) pandemic that, starting from the end of February 2020, began spreading along the Italian peninsula, by first attacking small…
A multi-region variant of the SIR model and its extensions
Luigi Brugnano, Felice Iavernaro
In this note, we describe simple generalizations of the basic SIR model for epidemic, in case of a multi-region scenario, to be used for predicting the COVID-19 epidemic spread in…
On the use of the Infinity Computer architecture to set up a dynamic precision floating-point arithmetic
Pierluigi Amodio, Luigi Brugnano, Felice Iavernaro +1
We devise a variable precision floating-point arithmetic by exploiting the framework provided by the Infinity Computer. This is a computational platform implementing the Infinity A…