## 30 Reputation

6 years, 229 days

## how i can get int(-s*k*phi(s)+(k*s^2+1)*...

Maple

restart;
variables := s, phi(s);
s, phi(s)
expr := (k*s^2+1)*(diff(phi(s), s, s))-k*phi(s)+s*k*(diff(phi(s), s));
/   2    \ / d  / d        \\                  / d        \
\k s  + 1/ |--- |--- phi(s)|| - k phi(s) + s k |--- phi(s)|
\ ds \ ds       //                  \ ds       /
expr2 := int(expr, s);
/   2    \ / d        \
-s k phi(s) + \k s  + 1/ |--- phi(s)|
\ ds       /
int(expr2, s);
/              /   2    \ / d        \   \
int|-s k phi(s) + \k s  + 1/ |--- phi(s)|, s|
\                         \ ds       /   /

solve({int(expr2, s)});
Error, (in solve) cannot solve expressions with int(-s*k*phi(s)+(k*s^2+1)*(diff(phi(s), s)), s) for s

## how to give condtion of constant to be p...

Maple

how can i define constants alpha and beta are positive in maple? ;these constants are coefficints of PDE (higgs field equation)

## pde solve in maple...

Maple 18

restart; with(PDEtools);
U := diff_table(Psi(`&psi;_2`, `&psi;_1`));
pde := `&psi;_2`*(diff(Psi(`&psi;_2`, `&psi;_1`), `&psi;_1`))+`&psi;_1`*U[`&psi;_1`]+2*U[] = 0;
&psi;_2 Psi(&psi;_2 + 1, &psi;_1)

+ &psi;_1 Psi(&psi;_2 + 1, &psi;_1) + 2 Psi(&psi;_2, &psi;_1) =

0
pdsolve(pde);
Error, (in pdsolve/info) first argument is not a differential equation

How can i solve it?

## how do i solve a system of PDE's with va...

Maple 18

how do i solve a system of PDE's with variable coeffiecients in Maple?

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