[isabelle] new AFP entry: Decreasing Diagrams

A new AFP entry is available from http://afp.sf.net

Decreasing Diagrams
by Harald Zankl

This theory contains a formalization of decreasing diagrams showing that any locally decreasing abstract rewrite system is confluent. We consider the valley (van Oostrom, TCS 1994) and the conversion version (van Oostrom, RTA 2008) and closely follow the original proofs. As an application we prove Newman's lemma.



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