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 Nov24 awarded Yearling Jul2 awarded Curious Nov24 awarded Yearling Jun11 accepted Closure and pathwise connected Jun11 asked Closure and pathwise connected Jun10 asked Finding the correct formula for a sequence Jun10 accepted Card game with 36 cards Jun10 comment Card game with 36 cards $K$ can be any value between $1$ and $36$, correct? Or betwwen 1 and infnity? Jun10 comment Card game with 36 cards I think it is $(i-1)\frac{7}{9}i\frac{2}{9}$ because $\frac{7}{9}$ is the probability not getting a heart Jun10 comment Card game with 36 cards Thanks, if we consider it with replacement, what do you get for $P(K=i)$? Jun9 revised Card game with 36 cards edited body Jun9 comment Card game with 36 cards Oh yes, thanks. I'will edit it. Jun9 asked Card game with 36 cards Jun2 accepted Showing it is a joint probability density function May19 comment Showing it is a joint probability density function Thanks, how can things like $P[X=1/2,Y=1/2]$, $P[X=Y]$ and $P[x\le 1/2, Y\le 1/2]$ expressed using the integrals? I know that we con da it using the cumulative distributin function F(x,y) but I do not know how. May18 comment Showing it is a joint probability density function Do you also have an idea for the cumulative distributions? May18 asked Showing it is a joint probability density function May13 accepted Order topology neighborhood May13 comment Order topology neighborhood Ok, in the case of $\langle 1,1\rangle$: $a=0: (0,b]\times \{1\}$ $a>0: (a,1]\times [0,1]$ together with $\{a\}\times (0,b]$ I do not know if these are correct. The last thing is if could explain the cases $\langle x,0\rangle$ and $\langle 0,x\rangle$ a little bit more in detail. May13 comment Order topology neighborhood First of all, thank you for your help. Secondly, why exactly do you use the notation $<>$ for elements in $Z$, is this simply to distinguish from the other intervals $()$ or is there a deeper meaning? Thirdly, in the two cases you consider in the end, why only for $a$ and not also for $b?$. Fourthly for $<1,1>$ I get $(,<1,1>]$, but which cases do I need to consider now? Fifthly, what about  and $<0,x>$, are these intervals special cases of the cases we already considered?