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Mathematics
Jordan B's user avatar
Jordan B's user avatar
Jordan B's user avatar
Jordan B
  • Member for 3 years, 5 months
  • Last seen this week
  • Cambridge, England
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15
Proving $\lvert\sin x\rvert + \lvert\cos x\rvert\geq 1$, for real $x$, without calculus
Apr 21
9
Prove $\int_{0}^{\infty} \frac{\arctan(x^3)}{x^2} \ dx = \frac{\pi}{\sqrt3}$
May 26, 2025
6
Let $G$ be a finite group $a,b \in G$, prove that $|𝐺| +\frac{|G|}{|⟨𝑎⟩|} +\frac {|G|}{|⟨b⟩|} +\frac{|G|}{|⟨𝑎b⟩|}$ is even.
May 31, 2025
6
Proving no simple group of order 120 exist via sylow arguments
Apr 17
5
Using cohomology to classify groups of order $p^3$
Mar 20
4
Show the Coxeter group $\langle r,s,t \mid r^2, s^2, t^2, (rs)^2, (st)^3, (rt)^3 \rangle$ is finite
Jul 11, 2025
4
Vector bundles on nodal curves
Oct 10, 2025
4
Canonical divisors in Tate's thesis
Apr 22
4
Invertibility in the Calkin Algebra
Apr 23
3
Prove that the product of four consecutive positive integers is not a power of any positive integer with exponent greater than or equal to 2.
May 26, 2025