Thu, 26 Apr 2018 12:55:48 +0100 some of Jose Divasón's material from Rank_Nullity_Theorem/Miscellaneous
paulson <lp15@cam.ac.uk> [Thu, 26 Apr 2018 12:55:48 +0100] rev 68043
some of Jose Divasón's material from Rank_Nullity_Theorem/Miscellaneous
Thu, 26 Apr 2018 12:32:13 +0200 spelling;
wenzelm [Thu, 26 Apr 2018 12:32:13 +0200] rev 68042
spelling;
Wed, 25 Apr 2018 21:29:02 +0100 more messy proofs redone, and new material
paulson <lp15@cam.ac.uk> [Wed, 25 Apr 2018 21:29:02 +0100] rev 68041
more messy proofs redone, and new material
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