Fri, 27 Jan 2017 17:28:10 +0100 nipkow removed unclear clause; slower but clearer
Fri, 27 Jan 2017 12:32:49 +0100 nipkow removed contribution by Daniel Stuewe, too detailed.
Thu, 26 Jan 2017 17:51:13 +0100 nipkow added concise log height bound lemma
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