618 reputation
312
bio website
location Singapore
age 37
visits member for 2 years, 4 months
seen yesterday

a little learning is a dangerous thing


Jul
22
comment How hard should a mathematician work?
I've a friend, tenor already, still quite frequently works into 9pm at weekends.
Jul
22
comment Changing order of integration limits
for when the integration order could be changed, you may refer to en.wikipedia.org/wiki/Fubini%27s_theorem Fubini-Tolleni theorem.
Jul
17
awarded  Quorum
Jul
8
comment Surprising identities / equations
how do you derive that?
Jul
7
comment 'Obvious' theorems that are actually false
thanks for the link... a bit tough for me, will bookmark it for later digestion :)
Jul
7
comment 'Obvious' theorems that are actually false
this is obvious right -- isn't it?
Jul
7
comment 'Obvious' theorems that are actually false
@Duncan what's the minimum number of side for the dices? would you please quote an example of that voting?
Jul
2
awarded  Curious
Jul
2
awarded  Inquisitive
Jun
25
comment Independence Lemma, is it non-trivial?
my problem is i read the proof and didn't find its essence -- i don't see the point until you mentioned "be careful with respect to which variable you integrate" -- i think now i got the point. For Fubini-Tonelli theorem I mean it's an integration issue, but the conditional distribution is more tricky as it's not explicit defined by an integration, but the idea looks similar.
Jun
25
comment Independence Lemma, is it non-trivial?
thank you, now i got a hint why it's related to measure. it seems similar to the Fubini-Tonelli theorem ( en.wikipedia.org/wiki/… ) in analysis that states $\int_X\left(\int_Y f(x,y)\,\text{d}y\right)\,\text{d}x=\int_Y\left(\int_X f(x,y)\,\text{d}x\right)\,\text{d}y=\int_{X\times Y} f(x,y)\,\text{d}(x,y)$, is it?
Jun
25
accepted Independence Lemma, is it non-trivial?
Jun
25
revised Independence Lemma, is it non-trivial?
i tried to update it so that i could understand better.
Jun
25
suggested suggested edit on Independence Lemma, is it non-trivial?
Jun
24
asked Independence Lemma, is it non-trivial?
Jun
18
comment Steiner tree problem in 3D?
i have to admit there're quite some papers, i'm a bit overwhelmed. perhaps i'll read sometime later
Jun
17
accepted Calculating $\Sigma_{k=1}^\infty (2+\frac{1}{k}-\frac{3}{k+1})$
Jun
16
asked Steiner tree problem in 3D?
Jun
13
comment how to prove the solution to brainteaser “Urban planning”
thanks! this question can be closed. indeed it's duplicated.
Jun
13
asked how to prove the solution to brainteaser “Urban planning”