Occasionally it might happen that I want to contact some user, although the thing I want to say is not directly relevant to one of their posts - which makes me think that this would be not really suitable for a comment under one of their post (where they would be notified). What can be done in si...
One convenient thing on AoPS that is missing on MO is the private message system where you can send and receive private messages to other users without figuring out who they are outside the internet and what is their e-mail, etc., or full disclosure of who you are yourself. The situations where y...
There has been quite a few times that I wished I could send a message to another user on SO - not ask a question for everyone to see, but just a short message informing them of something or requesting them to do something. Are there any plans to allow this to happen in the future? Related: How ...
Consider the following fragments from "An invitation to quantum groups and duality" by Timmerman: Question: In remark 2.1.6 (ii), it is stated that the homomorphism $\Delta\otimes \text{id}: A \otimes A \to A \otimes A \otimes A$ is extended to a homomorphism $M(A \otimes A) \to M(A \otimes A \o...
Consider the following definitions given in Timmerman's book "An invitation to quantum groups and duality": m Further in the book, it is claimed that if $A$ and $B$ are non-degenerate algebras, then we have a canonical inclusion $M(A)\otimes M(B)\hookrightarrow M(A\otimes B)$. How exactly does t...
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