picasso
Reputation
3,229
Top tag
Next privilege 5,000 Rep.
Approve tag wiki edits
 Jul 29 revised How to prove $\frac{2^a+3}{2^a-9}$ is not a natural number added 37 characters in body Jul 29 comment How to prove $\frac{2^a+3}{2^a-9}$ is not a natural number and $-12\not\geq 0$... ! Jul 29 answered How to prove $\frac{2^a+3}{2^a-9}$ is not a natural number Jul 29 revised Points on 3d line added 242 characters in body Jul 29 revised Points on 3d line added 303 characters in body Jul 29 answered Points on 3d line Jul 29 comment What's special about the cauchy product? In your second paragraph the multiplicands $\sum a_n$ and $\sum b_n$ are completely independent, e.g. you can write $C_n=\left(\sum a_k\right)\left(\sum b_k\right)$. That's trivial. The Cauchy product combines terms in a non-trivial way. Cauchy products can be useful. Jul 27 revised evaluate $\frac 1{1+\sqrt2+\sqrt3} + \frac 1{1-\sqrt2+\sqrt3} + \frac 1{1+\sqrt2-\sqrt3} + \frac 1{1-\sqrt2-\sqrt3}$ deleted 17 characters in body Jul 27 revised evaluate $\frac 1{1+\sqrt2+\sqrt3} + \frac 1{1-\sqrt2+\sqrt3} + \frac 1{1+\sqrt2-\sqrt3} + \frac 1{1-\sqrt2-\sqrt3}$ deleted 41 characters in body Jul 27 answered evaluate $\frac 1{1+\sqrt2+\sqrt3} + \frac 1{1-\sqrt2+\sqrt3} + \frac 1{1+\sqrt2-\sqrt3} + \frac 1{1-\sqrt2-\sqrt3}$ Jul 23 revised Logarithmic Integral II deleted 251 characters in body Jul 23 answered Logarithmic Integral II Jul 23 revised How to solve $z^3 + \overline z = 0$ added 466 characters in body Jul 23 comment Does the series $\sum\limits_{n=1}^\infty \frac{1}{n\sqrt[n]{n}}$ converge? +1 very simple ! Jul 23 revised Simple Logarithms Equation added 30 characters in body Jul 23 comment Simple Logarithms Equation Assuming $x\in\mathbb{R}$, and since $3^x>0$ for all $x\in\mathbb{R}$, then $3-x>0$ which implies $x<3$. Jul 22 comment If I buy 2 lottery tickets do I double my chance of winning? Which gives $$\frac{1}{{49\choose 6}}=0.00000007151123842...$$ I'd better get a better paid job. Jul 22 answered compute the integral Jul 21 answered How to solve $z^3 + \overline z = 0$ Jul 13 revised How to remember trig identities? added 108 characters in body