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Mathematics
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TG173
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undergraduate student in pure math

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3
Help Understanding Proof for Inequality Problem #3 from Problem Solving Strategies
Nov 2, 2019
3
Number of ways to send out $k$ distinct postcards to $n$ friends if we require each friends receives at least $1$ post card.
Aug 7, 2022
3
Determine the maximum value of the sum $S=\sum_{n=1}^\infty \frac{n}{2^{n}} (a_1a_2…a_n)^{1/n} $
Jul 19, 2023
2
Is my Proof for the following problem correct? Prove that $a+b+c\leq\frac{a^3}{bc}+\frac{b^3}{ac}+\frac{c^3}{ab}$
Nov 8, 2019
2
Find all functions $f:\mathbb{N}\rightarrow\mathbb{N}$ such that $yf(x)+xf(y)=(x+y)f(x^2+y^2)$ [duplicate]
May 6, 2020
2
Show that for an odd integer $n ≥ 5$, $5^{n-1}\binom{n}{0}-5^{n-2}\binom{n}{1}+…+\binom{n}{n-1}$ is not a prime number.
Jun 7, 2023
1
Prove on $n$ people there are two such that among the $n-2$ there are at least $\lfloor n/2\rfloor-1$, either all knowing or not knowing the two.
May 26, 2023
1
Winding Number, Argument Principle, and Essential Singularities
May 23
0
Limit of $\lim_{x\to0}\,\ln(x-\ln(x))$
Apr 24, 2020
0
Given an $F$-module, is the multiplicative identity unique?
Aug 29, 2023