Re: [fricas-devel] Re: Programming with BTREEs.

Dear Ralf,

I'm extremely grateful that you answered...

Ralf Hemmecke <[email protected]> writes:
N := Union(Symbol, List Integer)
BT := BinaryTree N
B ==> binaryTree  -- the 3-argument version
V ==> binaryTree  -- the 1-argument version
bt:BT:=B(V e,[5,1],B(B(V a,[1,1],V b),[1,1],B(V c,[1,2],V d)))

[...]

S==>Symbol
L==>List Integer
construct(x: S, l: L, y: S): BT == binaryTree(V(x::N), l::N, V(y::N))
bt2: BT := [e,[5,1],[[a,[1,1],b],[1,1],[c,[1,2],d]]]

['a, [1,3], 'b]@BT

works for me

but 

[e,[5,1],[[a,[1,1],b],[1,1],[c,[1,2],d]]]@BT

cannot work, I think, because the argument types don't match.  You
will need to allow also binary trees.

Martin