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visits member for 1 year, 9 months
seen Aug 12 at 11:22

Jul
25
accepted Explain why $\big(\int_{-\infty}^{\infty}e^{-z^2/2}dz \big)^2 = \int_{-\infty}^{\infty}\int_{-\infty}^{\infty}e^{-(z^2 + u^2)/2}dzdu$
Jul
25
asked Explain why $\big(\int_{-\infty}^{\infty}e^{-z^2/2}dz \big)^2 = \int_{-\infty}^{\infty}\int_{-\infty}^{\infty}e^{-(z^2 + u^2)/2}dzdu$
Jul
2
awarded  Curious
Mar
14
comment How can the y-axis in $\mathbb{R^2}$ be open?
I am coming off these anti-depressants, I can't think straight.
Mar
14
asked How can the y-axis in $\mathbb{R^2}$ be open?
Mar
14
asked $X \sim N(5, \sigma^2$). If $P(X < -1) = 0.1587$, what is the standard deviation $\sigma$ of $X$?
Mar
11
comment Proof of implication in Product Space
I am not sure what you are doing in the second part?
Mar
11
revised Proof of implication in Product Space
edited body
Mar
11
asked Proof of implication in Product Space
Mar
10
accepted Product topology on $X \times Y$ the smallest topology when $f(x, y) = x$ and $g(x, y) = y$ are continuous functions?
Mar
10
comment Product topology on $X \times Y$ the smallest topology when $f(x, y) = x$ and $g(x, y) = y$ are continuous functions?
Well I would define it as the set $\{(u, v) \in X \times Y: u$ open in $X$ and $v$ open in Y$\}$
Mar
10
asked Product topology on $X \times Y$ the smallest topology when $f(x, y) = x$ and $g(x, y) = y$ are continuous functions?
Mar
9
comment Relationship between $f$ and $f^{-1}$ unclear
So what is $f^{-1}(2, 4)$?
Mar
9
asked Relationship between $f$ and $f^{-1}$ unclear
Mar
9
asked $[4, 5) \bigcup (8,9]$ a subspace topology on $\mathbb{R}$ with standard topology - finding open and closed subsets
Mar
9
comment Cartesian product of open sets
@DanielRust Cheers, I really need to stop being so sloppy. I always believe that mixing up subset and element of makes a statement just plain wrong, even though generally you can see what people meant.
Mar
9
awarded  Critic
Mar
9
revised Cartesian product of open sets
added 16 characters in body
Mar
9
comment Cartesian product of open sets
@TobiasKildetoft Oops, I meant open in $\mathbb{R}$
Mar
9
asked Cartesian product of open sets