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Mathematics : Recent Questions and Answers (Page 166)

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

Can someone help me with this other limit?

$$ lim_{x to 0} frac{(sin x - tanh x)^2}{(e^{x}-1-ln{(1+x)})^3} overset{??}{=} frac{1}{36} $$ If you consult the graph it is intuitive to think that when $ x to 0...

Asked on 12/25/2020 by Toni Rivera Vargas

2 answer

Can you prove why the recurrence $3P_{n} - 2P_{n + 1} = P_{n - 1}$ holds for some (a subset of the) prime numbers?

Can you prove why this recurrence relation holds for some (a subset of the) prime numbers? And does it go on infinitely? (I think it does) $$3P_{n} - 2P_{n...

Asked on 12/25/2020 by Joebloggs

1 answer

Probabilities involving people randomly getting off floors on an elevator

An elevator in a building can stop at floors $1$ through $6$. Four people get on the elevator at floor $1$ and each person picks a floor...

Asked on 12/25/2020 by user747916

0 answer

Backward-Euler implicit integration for multiple variables

I'm a bit confused how the Backward-Euler implicit integration method works for multiple variables (i.e., systems of differential equations). For single variables, we solve the implicit equation $$x(t + Delta...

Asked on 12/25/2020 by user541686

1 answer

What are the continuous functions $mathbb{N} to mathbb{R}$ when $mathbb{N}$ is given the coprime topology?

Consider $mathbb{N}$ with the topology generated by sets of the form $U_{a,b}=mathbb{N} cap {an+b: n in mathbb{Z}} $ where $text{gcd}(a,b)=1$. What are the continuous functions...

Asked on 12/25/2020 by TheDayBeforeDawn

1 answer

Determine the smallest positive integer n, which has exactly 144 distinct divisors and there are 10 consecutive integers among these divisors.

We know that after the prime factorization of that number when the powers of those prime factors +1 when multiplied with each other would result in 144.144 = (a+1)(b+1)....

Asked on 12/25/2020 by AdhirajSinghBrar

1 answer

Why in the ε-δ definition of a limit is x∈D instead of just ℝ

ε-δ definition: $(forall epsilon >0) (exists delta >0)(forall x in D) (0 < lvert x - a rvert < delta Rightarrow lvert f(x) - L rvert < epsilon)$...

Asked on 12/25/2020 by Tiffany

2 answer

Finding a function satisfying the given differential equation.

Let $mathrm{f:(0, infty) rightarrow(0, infty)}$be a differentiable function such that $mathrm{{f}'left( frac{a}{x} right)=frac{x}{fleft( x right)}}$ where $a$ is positive constant and $f'(1) = 1$, ...

Asked on 12/24/2020 by siddharth kalra

2 answer

What is a Gauge symmetry, intuitively (string theory)?

I'm writing an essay for a popular (but mathematically mature) audience on the history of mathematical physics, wherein I have a section devoted to string theory. Unfortunately, neither I (nor...

Asked on 12/24/2020 by KeithMadison

1 answer

Do we have false statement in inconsistent systems?

This is a rather soft question. My understanding: Suppose we have $x in ℝ$ and $x^2 = -1$ [in the normal interpretation]. Then the statement "there exists ...

Asked on 12/24/2020 by J-A-S

2 answer

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