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Mathematics : Recent Questions and Answers (Page 155)

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

Terence Tao Analysis I on defining subtraction operation problem

I have been reading Tao’s Analysis I, Chapter 4 which he builds up the definition of integers and in particular, the definition of subtraction using a placeholder “ $...

Asked on 01/08/2021

1 answer

How to prove $Pleft(cup_{i=1}^{infty}A_iright)=1$ implies that $P({A_i i.o.})=1$

Suppose that ${A_i}$ is a sequence of independent events with $Pleft(bigcup_{i=1}^infty A_iright) = 1$ and $P(A_i)<1$ for all $iin mathbb{N}$. Show that$$P(A_i text{...

Asked on 01/07/2021 by Xiangdong Meng

1 answer

Finding the order of a pole of a complex function

So many solutions on here seem to use the following result: if $f(z)$ has a pole at $z_0$, and $lim_{z to z_0}(z-z_0)^{m}f(z)$ is finite and non-zero (or...

Asked on 01/07/2021 by Prasiortle

1 answer

Can someone find a (two-sided) inverse function to the characteristic function χ? given...

so i have given the folowing info: In general, if $A$ is a set, for $S in mathcal P(A)$ define $chi(S) : A to {0,1}$ by ...

Asked on 01/07/2021 by TheCreator

2 answer

How To Prove This Is Continuous Or Discontinuous

How do I prove this is continuous/discontinuous? A function $f(x)$ (can be any function, in general) is defined on the interval $[3,7]$, where $f(3)=2$ and $f(7)=4$....

Asked on 01/07/2021 by Mat Rhine

1 answer

Given ?1 and ?2, how do you calculate ?3 and ?4 after shortening the line segment by equal distance on each point?

Let's say I have a line segment given ?1 and ?2. I can calculate the Distance between the two, and the Slope, which will help. I want to 'shorten' the...

Asked on 01/07/2021 by Jordan Farris

1 answer

Aprroximating the area of a surface of revolution using simpsons rule

Consider the surface of revolution generated from rotating the curve $3xe^x$ from $0 leq x leq 1$ about the $x$-axis. So, the integral will look like: ...

Asked on 01/07/2021 by FireFenix777

1 answer

The transportation problem with uncertain (and, in general, linearly interdependent) supply- and demand values

I'm looking at a transportation problem:$$min_{x_{ij}} sum_{i=1}^{m}sum_{j=1}^{n} c_{ij}x_{ij}$$subject to$$sum_{j=1}^nx_{ij} = s_i, mbox{ for all } i=1,...,m.$$and$$sum_{i=1}^mx_{ij} = d_j, mbox{ for all }...

Asked on 01/07/2021 by Rasus

0 answer

Finding maximum of this function in complex analysis

This particular question is from my assignment in complex analysis and I need to verify my answer and way of solving.Let $f$ be analytic for $|z| leq 3$...

Asked on 01/07/2021 by Avenger

0 answer

Is my solution to this first order ODE correct? (Integrating factor method)

The question wants me to prove the following ODE via integrating factor method:$$ frac{dx}{dt} + frac{t}{(1+t^2)}x = frac{1}{t(1+t^2)} $$ I got my integrating factor to be $...

Asked on 01/07/2021 by Ryan Seah

1 answer

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