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 Apr 12 awarded Famous Question Dec 7 awarded Popular Question Apr 8 awarded Notable Question Sep 13 awarded Popular Question Jun 9 revised Conditional expectations when conditioning on a discrete sigma-algebra added 84 characters in body Jun 9 asked Conditional expectations when conditioning on a discrete sigma-algebra Jun 9 revised expectation of product of independent random variable edited title Jun 9 asked expectation of product of independent random variable Jun 9 accepted probability question on characteristic function Jun 9 asked How to use joint characteristic function to calculate characteristic function for single variables? Jun 9 revised probability question on characteristic function added 3 characters in body Jun 9 asked probability question on characteristic function May 30 accepted existence of Lebesgue integral May 30 accepted Example that the Lebesgue integral of a function can take any value between $[0,c]$ May 30 accepted Prove that $f_n$ converges to $f$ in $L_1$ norm given $\int f_n \to \int f$ May 30 revised How to find irreducible polynomials over $\mathbb{Q}(i)$ with prescribed Galois group? added 273 characters in body May 30 comment How to find irreducible polynomials over $\mathbb{Q}(i)$ with prescribed Galois group? @Lubin : I found I made mistakes in looking for polynomial in Q[x] whose galois group isormorphic to C2xc2 , C5 . For isomorphic to C2xC2, the only polynomial I can think of is of(X^2 - D1)(x^2 -D2) form , where D1 , D2 are not square in Q . However , this should be reducible in Q .. For C5 , the polynomial I found is reducible too.. Some of my classmates think there is no such irreducible polynomial over Q in C2xC2 and C5 case .. Is that correct ? I am wondering if there is some systematic way to find these polynomials . May 29 asked How to find irreducible polynomials over $\mathbb{Q}(i)$ with prescribed Galois group? May 29 asked An elementary graph theory problem May 26 comment existence of Lebesgue integral i havent learnt laytex... Can any one help me to edit it ?