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 Feb 22 revised Matrix rank inequality deleted 2 characters in body; edited tags Feb 22 answered $\sigma$-algebra generated by a subset Feb 22 comment How to find second order derivative when i posted an answer, i made a mistake in calculations, so i thought i well knew what the answer was. as for this comment, it is not an answer, just a suggestion along which lines i would think... Feb 19 revised Taylor series expansion of $f(x)=e^{-x^2}$ edited title Feb 19 comment Proof that this distribution is N(0,1)? @user270494 yes Feb 18 comment Proof that this distribution is N(0,1)? @user270494 depends on the form. In the most common form for a stochastic process $Z_n$ with mean $m$ and stdev $s$, we have $$\frac{\bar{Z}_n - m}{s/n} \to \mathcal{N}(0,1)$$ Feb 18 answered Proof that this distribution is N(0,1)? Feb 18 revised Proof that this distribution is N(0,1)? added 329 characters in body; edited tags Feb 18 answered Identify the misprint in a sequence Feb 18 comment How to find second order derivative you are right. possibly you can proceed by analogy with 2D, taking a total differential of a sorts to get $d^2 p = u (dt)^2 + s (dz)^2$ and maybe using $dz^2 = dt$, but not sure how. Feb 18 awarded Generalist Feb 17 comment Height of Isosceles Triangle don't think so -- different heights are possible. you could find the range for the height though... Feb 17 revised $f(x) = x\sin(1/x)$, $0 < x \le 1$, with $f(0) = 0$, is continuous on $[0, 1]$? added 40 characters in body Feb 17 comment Prove a connected graph has n-1 edges and has no cycle may help to proceed by strong induction on $n$ and reduce the graph by removing a leaf if it exists. Feb 17 answered How can I calculate, how the volume element transforms under change of co-ordinates? Feb 17 revised How can I calculate, how the volume element transforms under change of co-ordinates? added 61 characters in body; edited tags Feb 17 reviewed Approve Cardinality of $X \cup Y$? Feb 17 answered Cardinality of $X \cup Y$? Feb 17 comment creating positive definite matrix using wishrnd in matlab @sahar you can use my code to create the random positive definite matrix sigma you were asking about. The rest would work the way it is now. Feb 16 comment Showing that a derivable function $f$ (satisfying some conditions) is null. typically, Taylor's theorem is key for things like this, but not sure it will help here...