Hi everyone.
I have been experiencing a problem trying to solve a coupled system of 3 differencial equations
My problem is that a got a message back as I try to solve the system:
"Error, (in pdsolve/numeric/process_IBCs) improper op or subscript selector"
by apply this point that ''all dependent variables must be functions of the same independent variables''
i again accost with another error ''
Error, (in pdsolve/numeric/process_IBCs) initial/boundary conditions can only contain derivatives which are normal to the boundary, got (D[1, 1](w))(x, -3/400000000)
''
please help me.....very very thanks