Top network posts

• 23 Has anyone heard of this maths formula and where can I find the proof to check my proof is correct? $\sum^n_{i = 1}i + \sum^{n-1}_{i=1}i = n^2$
• 13 Let $\lambda$ be an eigenvalue of $A$. Prove that $\lambda^{-1}$ is an eigenvalue of $A^{-1}$.
• 11 Is there a property in $\mathbb{N}$ that we know some number must satisfy but don't know which one?
• 9 Knots of fixed genus with arbitrarily large volume
• 8 Fermat's Last Theorem: A natural extension
• 7 Does the $\gcd(2n-1,2n+1)=1?$
• 6 Remainder modulo 8
• View more network posts →