Tagging - 2017-11-20

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8:52 AM

@MartinSleziak I have asked a question on meta, but please feel free to edit as wish, since I do not quite know what more to add.

Martin Sleziak

@JohnMa Perhaps it would be reasonable to ping Henry somewhere and let them know about the question on meta.

Feeds

Q: The birthday tag

Recently the birthday tag has emerged and it quickly has around 100 questions tagged (mainly by one user I suppose). This is indeed not the first time we have this tag. The last time it was deleted and another tag calendar-computations was introduced. My concern is probably naive since my und...

Martin Sleziak

I have mentioned some stuff in the comments. Other than that, I do not have further suggestions.

Martin Sleziak

9:19 AM

Not related to this question, but just to let you know that I asked a question in meta concerning the tag "birthday". Hope you and more users familiar with probability can join the discussion there. — John Ma 19 mins ago

@MartinSleziak The same user created polarization-operators.

Q: Polarization Operators identity and $GL_{\ell}(\mathbb{R})$

Let $X$ be a matrix of variables $x_{ij}$ of size $\ell\times n$: \begin{equation*} X=\left(\begin{array}{cccc} x_{11}&x_{12} &\dots & x_{1n}\\ x_{21}&x_{22} &\dots & x_{2n}\\ \vdots& \vdots & \ddots & \vdots \\ x_{\ell 1}&x_{\ell 2} &\dots & x_{\ell n}\\\end{array}\right). \end{equation*} The ri...

combinatorics algebraic-groups invariant-theory generalized-polarization-modules polarization-operators

2 hours later…

Martin Sleziak

11:29 AM

Henry, normally we discuss the creation of new tags in meta before we proceed. May be you didn't know about this practice? Anyway, the tag you created is now being discussed in meta. You should probably weigh in. — Jyrki Lahtonen ♦ 1 hour ago

Yet another new tag: descriptorsystem.

Q: impulse detectability and impulse observability

Could anyone help me to understand mathematicaly as well as intuitively above mention concepts related to control theory of the system governed by the equations: $E\dot x= Ax+Bu$ and $Y=Cx$