# Tharsis

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bio website toolserver.org/~geohack/… location Stockholm, Sweden age member for 5 months seen 4 hours ago profile views 127

 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.

# 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

# 35 Tags

 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

# 1 Account

 Mathematics 855 rep 112