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Mathematics : Recent Questions and Answers (Page 141)

Find answers to your questions about Mathematics or help others by answering their Mathematics questions.

How can I show that $T(omega) = T(overline{omega})$ when $X_{t}(omega)=X_{t}(overline{omega})$ for all $t in [0,T(omega)]cap [0,infty)$

Consider the stochastic process $(X_{t})_{tin mathbb R_{+}}$ on a filtered probability space $(Omega,mathcal{F},(mathcal{F}_{t}^{X})_{tin mathbb R_{+}},mathbb P)$ where $mathcal{F}_{t}^{X}=sigma (X_{s}:0leq sleq t) $. Let $T$ be a...

Asked on 01/24/2021 by MinaThuma

1 answer

Is there a 'geometric' version of this derivation of the vorticity equation?

Recall that for each vector $omegainmathbb R^3$, there is an anti-symmetric matrix $ [omega]_timesinmathbb R^{3times 3}$ (and vice-versa) such that $$[omega]_times h= omegatimes h.$$ Matrix product on...

Asked on 01/24/2021 by Calvin Khor

1 answer

Does $f(x)=f(1/x) forall x$ put any restrictions on the derivative of $f$?

Consider a functions with the property that $f(x)=f(1/x) forall x not = 0$ and $f$ continuous. Does this tell us anything about the derivatives of $f$? I...

Asked on 01/24/2021 by user106860

2 answer

Convergence of $sum_{n=1}^{+infty}ntan left( frac{pi}{2^{n+1}}right )$

I am trying to find the convergence of the following series:$$sum_{n=1}^{+infty}ntan left( frac{pi}{2^{n+1}}right )$$ I am stuck trying out different tests but none of them seem to give...

Asked on 01/24/2021 by Dzamba

2 answer

Bijective coding of general graphs (like Prüfer code but not for trees)

I'am trying to find some way to effectively enumerate all possible graphs without repetition. I know there are Prüfer codes for trees, but what about other graphs? And if there...

Asked on 01/24/2021 by alagris

1 answer

A Partial Integral Equation

Is there any means to solve the "partial" integral equation of $u$: $$int_{l} u(x,y) dmathcal{H}^1=F(a,b,c)$$ (where $l={(x,y)|ax+by+c=0, a^2+b^2=1}$ is a straight line in $Bbb{R}^2$ and ...

Asked on 01/24/2021 by Zerox

0 answer

Every Closed Set In $R^1$ is intersection of countable collection of open set.

This is question I tried to solve as follows Consider $A$ be closed set in $Bbb R$ Therefore $Bbb{R}smallsetminus A$ is Open set .Now By Representation...

Asked on 01/24/2021 by idon'tknow

2 answer

Partial Derivatives : Given $f(x) = Ax^3 + By^3 - Cx - Dy + E$

Given $f(x) = Ax^3 + By^3 - Cx - Dy + E$ Propose any value for $A, B, C, D$ and $E$ so that these will give...

Asked on 01/24/2021 by Tahoh

1 answer

Using Argument principle to find roots of complex polynomial. Studying for qualifying exam

I know we need to use the argument principle to solve this, but I don't know how to use this. Argument Principle states: $$text{number of zeros}=frac{1}{2pi i}int_{partialOmega}frac{f'(z)}{f(z)}dz.$$...

Asked on 01/24/2021 by Machine Learner

0 answer

How to say limit of this expression is finite

I have to show that $(1-frac{t^2}{2r}+O(r^{-frac{3}{2}}))^{-r}rightarrow e^{frac{t^2}{2}}$ as $rrightarrowinfty$ I have expanded the given expression like below: $(1-frac{t^2}{2r}+O(r^{-frac{3}{2}}))^{-r}$ $= (1-frac{t^2}{2r})^{-r} - rO(r^{-frac{3}{2}})(1-frac{t^2}{2r})^{-r-1} + binom{r+1}{2}(O(r^{-frac{3}{2}}))^2(1-frac{t^2}{2r})^{-r-2}-...$ As ...

Asked on 01/24/2021 by user587389

1 answer

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