Tue, 28 Feb 2017 12:42:50 +0100 wenzelm tuned message;
Tue, 28 Feb 2017 15:17:57 +0000 paulson tidied some messy proofs
Tue, 28 Feb 2017 13:55:34 +0000 paulson Merge
Tue, 28 Feb 2017 13:51:47 +0000 paulson Renamed ii to imaginary_unit in order to free up ii as a variable name. Also replaced some legacy def commands
Tue, 28 Feb 2017 12:04:23 +0100 wenzelm more tests;
Tue, 28 Feb 2017 08:18:12 +0100 haftmann stripped unused / obsolete material
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