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How can one send comment to two participants X and Y simultaneously? Does the following works @X (and @Y). I learned this from some messages by moderatores in meta. but I am not sure …

In the question list we see that there are some questions which are pink. What is the reason of this situation?

I remember that I had asked a question about obstructions for a $n^2$ dimensional vector bundle for which the fibers admit a structure of matrix algebra. I do not remember whethe …

Can I ask MO to define a new tag "Singular perturbation". I did not find this tag among the tag list. Thank you

I add a Picture "GaussBonnet with Jpeg format to the following question but it does not work. (Some possible obstructions to ) Limit cycles as closed geodesics(3) Can one help me to resolve t …

I would appreciate if you explain on the meaning of the badge "Sportmanship". It is described as below but I can not understand what does it mean. May you describe this badge in an equivalent words …

There are some questions of mine with answers which I did not accept them,yet. Some of them (but not all of them) has an statement on the above of its title in the question list …

I frequently tried to draw a triangle commutative diagram similar to the definition of projective modules for this question. A module associated to an endomorphism of a vector bundle so I sea …

I would like to add an answer to this question but there is no any answer box for this question. What is the reason? Nonequivalent definitions in Mathematics

How to invite a user to a Private MO chat. I read the following but I do not know how to apply it yet. Your help is appreciated https://meta.mathoverflow.net/a/3635/36688 I have to …

Recently my question entitled "Non existence of a parametrically compatible metric to a complete geodesible vector field on $\mathbb{R}^2\setminus\{p,q\}$" is removed. What is the reason?

Is there a way to realize that, at a given moment, how many users are (MO) on line? Thank you

I asked this question from my phone and I realized that it represent me as a new contributor. I wish to ask the question from my own account. In the past I frequently used my original acco …

The following question of mine frequently appears as recently updated question so I frequently find it at front page. But neither me nor other participants did any revise or edit on this post and its …

Edit: My problem has been solved about 12 hours after that I wrote this meta post. I wish to answer this question but it seems that it is impossible to answer it. It is written that "To answe …