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Mathematics
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junjios
  • Member for 7 years, 2 months
  • Last seen more than a month ago
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5
Prove, for every nonnegative integer $n$, that $5^{2n} + 2^{2n} ≡ 2^{2n+1}\pmod{21}$.
Nov 14, 2021
5
Show that if $x,y>0$, $\left(\frac{x^3+y^3}{2}\right)^2≥\left(\frac{x^2+y^2}{2}\right)^3$
Feb 18, 2023
3
Can an exact vector field have loops as solutions?
Nov 15, 2023
3
Follow-up question on Abel Summation
Jul 15, 2023
3
How does $\frac{2\sqrt{7}}{3}\cos\left (\frac13\arccos\frac{1}{2\sqrt{7}}\right)+\frac23$ simplify to $1+2\cos\frac{2\pi}{7}$?
Jul 13, 2023
3
Fourier series of $\cos (x) $ in $[-\pi , \pi ] $ , coefficients are giving $0$
Feb 19, 2023
3
How to check if a point is behind a plane (along a vector)?
Mar 22, 2022
3
Question on "false" application of chain rule
Mar 27, 2022
2
Heat equation with Dirichlet and Neumann boundary conditions
Mar 16, 2022
2
Generalized Gronwall Inequality covering many different applications
Sep 22, 2023
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5
Fake ext4 file creation dates for a large number of files by setting the system time