Question: error using numeric option with pdsolve. Why?


Any help why this code fail

PDE := diff(u(x,y), y$2 ) + diff(u(x,y), x$2) = 0;
BC:= u(x,0)=0, u(x,100)=100, u(0,y)=0, u(10,y)=0;


Error, (in pdsolve/numeric/process_PDEs) PDEs can only contain dependent variables with direct dependence on the independent variables of the problem, got {u(0, y), u(10, y), u(x, 0), u(x, 100)}

But sol:=pdsolve([PDE,BC])  works OK and gives analytical solution.

What error Am I doing in the above code in this case?

Maple 2020 with Physics 642

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