2011-11-4: Update by Ondrej Kuncar
- Changes in the monolithic version of formalization:
- Added formalization of deletion
- The rest (namely formalization of insertion) was rewritten to Isar => speedup
- bal_l and bal_r were replaced by more convenient mkt_bal_l and mkt_bal_r functions
- insrt renamed to insert
2006-05-25: Update by Tobias Nipkow
- Did AVL trees properly, with height information in each node.
- Completely revised code and proofs
- Two developments, a monolithic and an incremental one.
- Got rid of the "extended tree type"by Brucker et al
because it stored the wrong information (bal!) and nothing useful
was proved about it.
2004-06-09: Update by Achim Brucker, Burkhart Wolff and Jan Smaus
- parameterized the tree definitions
- added a "efficient" variant of is-in (is_in_eff)
- some proofs about is_ord and is_in_eff
- a extended tree type that stores balancing information in its node and some proofs about it
2004-03-19: First submission
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