# Question:are these error messages to be expected from pdsolve?

## Question:are these error messages to be expected from pdsolve?

Maple 2021

I was trying Maple 2021.2 on this pde I saw on the net, and noticed it gives some error messages.

Are these to be expected and known?

 > interface(version);

 > Physics:-Version();

 > restart;
 > PDE := diff(u(t, x, y), t) = VectorCalculus:-Laplacian(u(t,x,y),'cartesian'[x,y]); bc := D[2](u)(t,0,y)=0,D[2](u)(t,1,y)=0, u(t, x, 0)=0,u(t, x, 3)=0; ic := u(0, x, y) = f(x,y); sol := pdsolve([PDE, bc,ic], u(t,x,y))

Error, (in assuming) when calling '`assume/NormalizeBoolean`'. Received: 'invalid input: type expects 2 arguments, but received 3'

 > restart;
 > PDE := diff(u(t, x, y), t) = VectorCalculus:-Laplacian(u(t,x,y),'cartesian'[x,y]); bc := D[2](u)(t,1,y)=0, u(t, x, 0)=0,u(t, x, 3)=0; ic := u(0, x, y) = f(x,y); sol := pdsolve([PDE, bc,ic], u(t,x,y))

Error, (in PDEAdvisor/2nd_order/Series/ThreeVariables) invalid input: has expects 2 arguments, but received 1

 > restart;
 > pde := diff(u(t, x, y), t) = VectorCalculus:-Laplacian(u(t,x,y),'cartesian'[x,y]); bc := D[2](u)(t,0,y)=0,D[2](u)(t,1,y)=0, u(t, x, 0)=0,u(t, x, 3)=0; sol := pdsolve([pde,bc], u(t,x,y))

Error, (in PDEAdvisor/2nd_order/Series/ThreeVariables) invalid boolean expression: NULL

 >