The study and application of differential equations in pure and applied mathematics, physics, meteorology, and engineering. | Contact experts in Differential Equations to get answers
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Questions related to Differential Equations
Is there a polynomial Hamiltonian vector field with a finite number of periodic orbits? Please see this MO question:...
22 January 2021 1,876 4 View
find to Differential Equations with the same method
22 September 2020 7,457 3 View
UPDATE: The values of the variables that I am currently concerned with are: a~65 V~3.887 While trying to solve a circuit equation, I stumbled onto a type of Lienard Equation. But, I am unable to...
12 July 2020 3,771 64 View
I'm trying to solve an important functional differential equation. But the problem is, it involves functional (variational) derivative, instead of partial ones. Can anyone suggest me a book where...
11 June 2020 6,886 3 View
Hello; I have this 2 nonlinear 2nd order differential equations. ode = (diff(y,t))^2 == (V^2)/(A-B*cos(y)); ( in matlab format) IC:y(0)=0 ode = (diff(g,t))^2 == (V-(t-X))^2/(A-B*cos(g)); ( in...
17 August 2019 6,313 7 View
08 August 2019 4,537 7 View
Hi dear researchers, I am currently implementing direct collocation NMPC, However, I have a doubt on the control value for the first control u_0 that should be applied to the system once the...
29 July 2019 1,957 3 View
I have solved nonlinear FODE for an IVP, but in case of solving linear FODE, my question is can I solve the linear set of equations using the same algorithm? Thank you in advance.
26 July 2019 2,340 1 View
07 July 2019 9,694 1 View
07 July 2019 9,102 3 View
A fundamental question for any PDE is the existence and uniqueness of a solution for given boundary conditions. For nonlinear equations these questions are in general very hard, hence we need an...
05 May 2019 1,373 3 View
Yes, there is a new method which is called Piecewise Analytic Method (PAM). It does more than Runge-Kutta. 1. PAM gives a general analytic formula that can be used in differentiation and...
11 April 2019 3,214 42 View
There are various methods that have been used in solving the fractional differential equations, but I am wondering what are the most powerful and efficient ones that can be applied effectively in...
04 April 2019 7,230 28 View
04 April 2019 454 41 View
It's very similar to modified Bessel function. But it's second coefficient is 2 rather than 1. r^2dX^2(r)/dr^2+2rdX(r)/dr-(r^2+p^2)X(r)=0 , p is a known quantity.
27 February 2019 5,455 3 View
Dear All, I am hoping that someone of you have the First Edition of this book (pdf) Introduction to Real Analysis by Bartle and Sherbert The other editions are already available online. I need...
25 February 2019 1,674 21 View
02 February 2019 7,715 3 View
Dear Pr Mainardi, I am a teacher researcher at Badji Mokhtar University Annaba,Algeria. I have a problem with the inverse Laplace transform of fractional differential equations. In your article...
01 January 2019 954 4 View
Let f be the pdf of a n dimensional N(0,C) distribution i.e up to a multiplicative constant, f(x)=exp(−0.5 x′C−1x). Which vector fields F are so that div(F)=f ?
11 November 2018 4,114 4 View
Could there be nonlinear ODEs that could not even be solved numerically? I am working on a third-order nonlinear problem which is giving accurate results for a given set of initial conditions...
11 November 2018 2,279 7 View
The function assumes a direct and reverse law. What do we know about the inverse function? Never mind. This is just the shadow of the direct function. Why don't we use the inverse function, as...
11 November 2018 719 49 View
As for example, light beam attenuation is described by the differential equation dS/dx = -S which solution is S~e(-x). But what physical processes could be described by the...
11 November 2018 8,749 21 View
I am solving a problem from fluid dynamics; in particular tightly coupled nonlinear ordinary differential equations. The following is a scaled-down version of my actual problem. I have solved...
11 November 2018 6,605 28 View
04 November 2018 4,435 49 View