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Apr 7, 2021 at 8:08 comment added Leo Alonso @PeterMay Of course, TR3 is logically redundant. However it may help as a step to understand the axioms. In my presentation I tried to emphasize the conceptual aspects. There are several ways to approach the octahedral axiom, and in my experience several people prefers different presentations to grasp it better.
Apr 21, 2020 at 14:21 comment added Leo Alonso @Anonyme I've edited the post with my previous comments, now deleted.
Apr 21, 2020 at 14:21 history edited Leo Alonso CC BY-SA 4.0
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Apr 20, 2020 at 20:32 history bounty ended Amos Kaminski
Apr 20, 2020 at 16:36 comment added Amos Kaminski "Where the label "$+1$" refers to a shift of degrees. This forces the category to be graded: it has to have an automorphism, called "shift" or "suspension", denoted most frequently as $X[1]$ or $\Sigma X$" can you explain what do you mean by shift of degree
Apr 20, 2020 at 16:32 vote accept Amos Kaminski
Apr 19, 2020 at 19:49 history answered Leo Alonso CC BY-SA 4.0