Recent content by Fermat1

You need to start showing you have at least thought about the problem before posting.

Can you make that precise?

Euclid's algorithm; ok thanks

How do you know $x^3$ and $1+x$ are co-prime?

To my mind it doesn't really make sense that this kind of problem doesn't have a more elementary (less artificial I mean) solution. Having said that, if Fermat had a proof, he would have written it

Re: Algebra word problem $$x+y=6000$$ $$.06x+.11y=580$$ From first equation, $$x=6000-y$$ Thus, $$.06(6000-y)+.11y=580$$ $$360-.06y+.11y=580$$ $$y=4400$$ $$x=6000-y=1600$$ Therefore 1600 in 6% stocks and 4400 in 11% bonds

In your opinion did Fermat have a proof for his theorem?

sorry about my post, absolute nonsense mate

$$(x+1)^2-x^2=2x+1$$ $$x^2-(x-1)^2=2x-1$$ $$2x+1-(2x-1)=2$$

Isn't it basically this. Must be if RHS is the same Proof by induction $\frac1{1 \cdot 2} + \frac1{2 \cdot 3} + \frac1{3 \cdot 4} + \cdots + \frac1{n \cdot (n+1)} = \frac{n}{n+1}$ - Mathematics Stack Exchange

Hi, my question is my proof (in the image) correct?

Let $F:P(A)->P(A$) be monotone and $C$ be the union of sets whose image is invariant under F. Prove $F(C)=C$ https://i.stack.imgur.com/3Wjdg.png

Let $$X_1,\dots,X_n$$ be i.i.d $$N(\mu,\sigma^2)$$. What is the marginal pdf of $$\sum_{i=1}^n (X_i-\overline{X})^2$$. I'm guessing it's some sort of chi square distribution but how to find this I am unsure. Thanks

please help. I think my questions are clear enough. Just seems I never get help around here

on question 20, I think the answer is (A) because wouldn't AD then be perp to BD? In picture 2 question 4 I got (E) because the line should start at -2.5 ,not -3 In picture 2 question 5, I got (B). Seems like maybe a trick question. In picture 3 question 6, I got (C). Is that right? In...