Fri, 01 Dec 2017 16:58:26 +0100 wenzelm purge hidden nodes more thoroughly: is_hidden may become true only later;
Fri, 01 Dec 2017 15:49:01 +0100 wenzelm proper synchronized Map: this may be used on multiple threads;
Thu, 30 Nov 2017 17:00:19 +0100 eberlm bij_betw lemma for prime powers
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