# Tharsis

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bio website toolserver.org/~geohack/… location Stockholm, Sweden age member for 5 months seen 8 mins ago profile views 123

# 855 Reputation

-255 May 12
 +10 03:01 2 events Natural extension of the divisor function $\sigma$ to the complex integers $\mathbb{Z}[i]$ -265 00:12 removed User was removed
55 May 11
 +25 14:11 2 events How to derive $\cos\frac{n\pi}{3}=\frac{1+3(-1)^{[\frac{n+1}{3}]}}{4}$ +15 17:18 3 events Natural extension of the divisor function $\sigma$ to the complex integers $\mathbb{Z}[i]$ +15 09:50 accept an odd perfect number cannot be a prime number or a product of two prime numbers or power of prime number.
175 May 9
 +55 18:14 5 events Last 2 numbers of the product of divisors +50 17:18 bounty Proving that every $2\times 2$ matrix $A$ with $A^2 = -I$ is similar to a given matrix +30 14:55 3 events Finding normalised eigenvectors… +20 12:11 2 events Determinant problem +10 17:07 upvote How to derive $\cos\frac{n\pi}{3}=\frac{1+3(-1)^{[\frac{n+1}{3}]}}{4}$ +2 19:12 edit $X∈M_{m×1}(F)$ and $Y∈M_{1×n}(F)$: A Range Dimension Implication +2 18:59 edit What is $57^{46}$ divided by 17? +2 15:35 edit Summation of independent discrete random variables? +2 13:12 edit How do you calculate the modulo of a really high number with a large power, with a really high mod number? +2 11:39 edit A matrix satisfying $AB-BA=B$
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