Tharsis

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bio	website	toolserver.org/~geohack/…
	location	Stockholm, Sweden
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visits	member for	5 months
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41 Answers

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4	Proving that every $2\times 2$ matrix $A$ with $A^2 = -I$ is similar to a given matrix
3	Last 2 numbers of the product of divisors
3	Is the solution guide wrong?
3	Integral Question - $\int\frac{1}{x^2-6x}\,\mathrm dx$
3	an odd perfect number cannot be a prime number or a product of two prime numbers or power of prime number.

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855 Reputation

+20	Natural extension of the divisor function $\sigma$ to the complex integers $\mathbb{Z}[i]$
+25	How to derive $\cos\frac{n\pi}{3}=\frac{1+3(-1)^{[\frac{n+1}{3}]}}{4}$
+15	an odd perfect number cannot be a prime number or a product of two prime numbers or power of prime number.
+2	$X∈M_{m×1}(F)$ and $Y∈M_{1×n}(F)$: A Range Dimension Implication

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1 Question

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4	Natural extension of the divisor function $\sigma$ to the complex integers $\mathbb{Z}[i]$

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13 homework × 10	4 integral × 3
11 calculus × 5	4 real-analysis × 2
9 linear-algebra × 5	3 number-theory × 3
8 matrices × 3	3 elementary-number-theory × 2
6 multivariable-calculus × 3	2 combinatorics × 2

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