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Jul
5
comment Which journals publish research announcements?
Насчет третьего я не думал, спасибо.
Jul
5
comment Which journals publish research announcements?
Да, я знаю, конечно! В первом у меня уже два коротких сообщения за последние два года, мне как-то неудобно их дальше мучить. А у второго почему-то не нашлось рецензента в последний раз, когда я им слал, я поэтому сомневаюсь сейчас, правильно ли будет их теребить снова.
Jul
5
comment Which journals publish research announcements?
@JoonasIlmavirta, OK.
Jul
5
comment Which journals publish research announcements?
@AlainValette, oui, je sais. Je suis couriex de savoir s'il y a des autres.
Jul
5
comment Which journals publish research announcements?
@user64494: Perhaps I should have explained this from the very beginning. I mean, sometimes (for me this is the usual situation) the proof is so long that it's impossible to publish it in a usual journal. I have to send my paper to a journal that accepts long papers, but usually it's a long story, I have to wait for several years, so I think it's normal to announce the result in a short communication (and to post it in arxiv). I wonder if there are lists of journals that accept short communications?
Jul
5
asked Which journals publish research announcements?
Jun
29
comment Naive definition of surface area doesn't work?
Perhaps one needs to add that the vertical and the horizontal legs tend to zero "uniformly" in some sense... Where is this written?
Jun
29
comment Naive definition of surface area doesn't work?
@BenoîtKloeckner, as far as I understand it is sufficient to claim that the corresponding triangles in the set of parameters are right (i.e. one of their angles is right) and their legs are parallel to the coordinate lines. Is it true?
Jun
20
comment Axiomatic explanation of why the volume of a parallelepiped is equal to the area of its base times its height
Federico, as far as I understand, the problem with the equivalence of these two axioms arises when we define polytopes as compact sets (spanned by... etc), then $P\setminus Q$ needs not to be a polytope, and the functional $V_n$ is not defined on $P\setminus Q$.
Jun
20
revised Axiomatic explanation of why the volume of a parallelepiped is equal to the area of its base times its height
added 62 characters in body
Jun
20
comment Axiomatic explanation of why the volume of a parallelepiped is equal to the area of its base times its height
Even for the dimension $n=3$ this trick becomes bulky. To say nothing about $n>3$. Or I don't know something? Anyway this looks like a new invention of bicycle. It's difficult to believe that nobody did this before.
Jun
20
comment Axiomatic explanation of why the volume of a parallelepiped is equal to the area of its base times its height
Thank you, Liviu. I am reading this.
Jun
20
comment Axiomatic explanation of why the volume of a parallelepiped is equal to the area of its base times its height
Is it possible that this wasn't proved in textbooks?
Jun
20
comment Axiomatic explanation of why the volume of a parallelepiped is equal to the area of its base times its height
Eric, I don't understand. Do you mean that for proving this it is nesessary to extend $V_n$ to the Jordan (or Lebesgue) measure (and only after that this becomes evident)? I believe there is a simple trick that allows to prove this without going to Jordan.
Jun
20
comment Axiomatic explanation of why the volume of a parallelepiped is equal to the area of its base times its height
I meant, disappeared from the list of the questions on the main page. I thought, this means that nobody is interested.
Jun
20
comment Axiomatic explanation of why the volume of a parallelepiped is equal to the area of its base times its height
Perhaps, this is my bad English. What is it called when something appears and disappears immediately?
Jun
20
asked Axiomatic explanation of why the volume of a parallelepiped is equal to the area of its base times its height
Jun
5
awarded  Inquisitive
Jun
4
revised Analogs of the paralleloram identity in higher degrees
added 2 characters in body
Jun
4
asked Analogs of the paralleloram identity in higher degrees