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Just when I thought I was out, they pull me back in
36m

comment 
Where is the ErdosRado theorem stated in Erdos and Rado's Bull AMS paper?
Thanks! Now you point it out, it does seem clearer; I guess I was just left dazed by the length of the paper 
37m

accepted  Where is the ErdosRado theorem stated in Erdos and Rado's Bull AMS paper? 
37m

comment 
Where is the ErdosRado theorem stated in Erdos and Rado's Bull AMS paper?
Thanks! Avshalom and you answered almost simultaneously. Since the system only allows me to accept one answer, I am accepting Avshalom's in the spirit of "redistributing wealth" :) no offence intended 
43m

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Where is the ErdosRado theorem stated in Erdos and Rado's Bull AMS paper?
@AndresCaicedo Thanks. Did you mean subscript 2 in your comment? Or is the subscript $\kappa$ case a straightforward consequence of the subscript 2 case? 
1h

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Not especially famous, longopen problems which anyone can understand
@Dal I am not a number theorist, but I believe that a solution here would require one to introduce new techniques or make significant improvements to existing techniques. Note that the original question did not ask for questions which were "important to current mathematical research", merely that "There should already exist at least a small community of mathematicians who will care if one of these problems gets solved." 
1h

asked  Where is the ErdosRado theorem stated in Erdos and Rado's Bull AMS paper? 
4h

reviewed  Close about the weak comparison principle for p  Laplace equation 
4h

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about the weak comparison principle for p  Laplace equation
This question has been answered elsewhere 
4h

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Carlson's translatability
Could you please link to your question on MSE? 
4h

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Is every closed subgroup of dual group an annihilator?
Isn't this just (the Galois connection underlying) Pontryagin duality? 
8h

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this complex inequality have some background?and we can find stronger than this inequality?
I have not downvoted, and I have not voted to close, but one possible reason for the negative reaction is that you have asked many technical questions about inequalities without explaining why you want the answers, whether they are exercises that your supervisor has assigned to you, whether they are needed for your own research, which special cases you have already tried to verify, and so on. 
12h

reviewed  Leave Closed Linear algebra over principal rings 1 
1d

comment 
What are the Applications of Hypergraphs
I rolled back the previous edit which was incredibly minor and just tinkering with the OP's English to no significant effect, on a question which has long been inactive 
1d

revised 
What are the Applications of Hypergraphs
rolled back to a previous revision 
1d

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$V(A)\cong {\mathbb N}\cup\{0\}$ and $$V(A_+)\cong\{(m,n)\in {\mathbb Z}^2 \mid m,n \geq 0, \hbox{ $m+n$ even}\}. $$
Didn't we see the same question recently, and wasn't it closed? 
2d

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Open problems in compressed sensing
There used to be a maxim on MO of the form "MathOverflow is not for people to request other people to write encyclopaedia entries for them". I therefore suggest that Felix should try to narrow his question down first, after looking online at research and survey articles in compressed sensing 
2d

reviewed  Leave Open Real algebraic solution 
Dec 19 
comment 
How many ksubsets of the integers {1,…,n} sum to N?
Could you give a bit more background for your question? For instance, where did this question arise? Would you be happy with an asymptotic formula? etc 
Dec 19 
comment 
transition matrix
@11156 What is the point of reformatting an offtopic question? 
Dec 19 
comment 
transition matrix
This question appears to be offtopic here because it is asking people to help with your homework 