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All questions asked by David Beer

List all solved & unsolved questions asked by David Beer

Did Dumbledore lie to Harry about how long he had James Potter's invisibility cloak when he was examining it? If so, why?

1   Science Fiction & Fantasy Asked on 01/07/2021

albus dumbledore  harry potter  invisibility cloak 

My proof of $A^{mathrm{c}}$ is closed iff $A$ is open

1   Mathematics Asked on 01/05/2022

general topology  real analysis  solution verification 

Define $X_n=sum_{k=1}^n kx_k$ and $Y_n=sum_{k=1}^n ky_k$. Prove that there exists an $n$ such that $X_n<Y_n$.

2   Mathematics Asked on 01/05/2022

convergence divergence  measure theory  real analysis 

Find the values of $k$ that satisfy $gcd(a,b)=5$

2   Mathematics Asked on 01/05/2022

gcd and lcm  integers  number theory 

How find the solution to $ sum_{i=1}^{infty} left( frac{1}{2} right)^i left( frac{1}{i}right)$?

2   Mathematics Asked on 01/05/2022

sequences and series 

Closed form for the maximum of the two-variable function $(a x + (1 - a) y) (b (1 - x) + (1 - b) (1 - y))$

0   Mathematics Asked on 01/05/2022

calculus  constraints  lagrange multiplier  multivariable calculus  optimization 

Interesting connection between a word problem and a physics formula

0   Mathematics Asked on 01/05/2022

algebra precalculus  physics  word problem 

Possible Rule of thumb for sums of variances?

2   Mathematics Asked on 01/05/2022

probability  variance 

Suppose a pair of random variable is independent from another pair, does it mean that each random variable is independent from the other?

2   Mathematics Asked on 01/05/2022

logistic regression  machine learning  maximum likelihood  probability  statistical inference 

How do I verify this scaling relation?

0   Mathematics Asked on 01/05/2022

partial differential equations 

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