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ultralegend5385
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i like maths

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81
Mathematical justification of this "34" array trick
Apr 30
21
Solve $\begin{cases}x^2+y^4=20\\x^4+y^2=20\end{cases}$
Feb 1, 2021
13
How many seven-digit numbers have seven distinct nonzero digits that appear in increasing order from left to right?
Apr 25
9
Prove $\sum_{k=1}^{n} \frac{1}{k}\binom{n}{k}^{-1}=\sum_{k=1}^{n} \frac{1}{k}\frac{1}{2^{n-k}}$
Jun 21
7
Let $x,y,z\in[0,1]$. Find the maximum value of $\sqrt{|x-y|}+\sqrt{|y-z|}+\sqrt{|z-x|}$.
May 25, 2022
7
Disproving surjectivity of $f : \Bbb Z \times \Bbb Z \rightarrow \Bbb Z$, $f(u,v) = 3u + 6v$
May 1
7
How to prove that $A\subset B\implies \bar{A}\subset \bar{B}$
Jul 7
7
Can you solve two unknowns with one equation?
Jul 12, 2023
7
Implicit differentiation $(\sin x +y)/(\cos y +x)=1$
Nov 17, 2020
6
A little help with Derangements
Apr 18, 2022
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