4 commits

Author	SHA1	Message	Date
Floris van Doorn	5bb2c7859d	checkpoint for direct sum of graded modules	2017-04-10 20:34:49 -04:00
Floris van Doorn	dc2b905a7c	rename module to left_module	2017-03-30 18:33:33 -04:00
Jeremy Avigad	c0a301e141	fix left module namespace	2017-03-30 15:43:54 -04:00
Jeremy Avigad	41bc4b6673	chain complexes of modules	2017-03-10 11:51:24 -05:00