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1. • CommentRowNumber1.
   • CommentAuthorelif
   • CommentTimeMar 10th 2017
   • PermaLink
   Author: elif
   Format: TextIn https://arxiv.org/pdf/1208.6265.pdf, why does Majıd need the condition (1) in the definition 2.1?

   In https://arxiv.org/pdf/1208.6265.pdf, why does Majıd need the condition (1) in the definition 2.1?
2. • CommentRowNumber2.
   • CommentAuthorDavidRoberts
   • CommentTimeMar 11th 2017
   • (edited Mar 11th 2017)
   • PermaLink
   Author: DavidRoberts
   Format: MarkdownItexBetter formatting and linking to the abstract page: [Strict quantum 2-groups](https://arxiv.org/abs/1208.6265)

   Better formatting and linking to the abstract page: Strict quantum 2-groups

3. • CommentRowNumber3.
   • CommentAuthorelif
   • CommentTimeMar 11th 2017
   • PermaLink
   Author: elif
   Format: TextOk. Why does Majıd need the condition (1) in the definition 2.1?

   Ok. Why does Majıd need the condition (1) in the definition 2.1?
4. • CommentRowNumber4.
   • CommentAuthorTobyBartels
   • CommentTimeMay 31st 2017
   • PermaLink
   Author: TobyBartels
   Format: MarkdownItexI assume that you\'re asking why he needs the equation $$ h_{(1)} \otimes h_{(2)} \triangleright a = h_{(2)} \otimes h_{(1)} \triangleright a $$ (for $h$ in the ground Hopf algebra $H$ and $a$ in the Hopf $H$-algebra $A$), rather than the entire set-up in that condition; without that set-up (consisting of $H$ and $A$ themselves), you\'d have nothing to talk about. I don\'t remember enough about Hopf algebras to answer your question either, but I\'m trying to understand it. ☺️

   I assume that you're asking why he needs the equation

   $$h_{(1)} \otimes h_{(2)} \triangleright a = h_{(2)} \otimes h_{(1)} \triangleright a$$

   (for $h$ in the ground Hopf algebra $H$ and $a$ in the Hopf $H$-algebra $A$), rather than the entire set-up in that condition; without that set-up (consisting of $H$ and $A$ themselves), you'd have nothing to talk about.

   I don't remember enough about Hopf algebras to answer your question either, but I'm trying to understand it. ☺️