Re: [Haskell-beginners] Re: How to delete a range from AVL tree.

Hello Alexander I suspect mydelete' isn't working because it needs a "sorted" tree - either the initial tree you are supplying isn't sorted or it becomes unsorted after one delete step. I don't know the AVL library at all (I only installed it now to look at your problem) so I can't say from looking at the constructors whether the problem tree is malformed, the problem tree being:

P (Z E 1 E) 3 E

Potentially very few people use the Avl module which is why you haven't had a reply yet. You could try posting to the Cafe instead if you don't get a better answer. Best wishes Stephen