Hello World

Testing the publication!

Which one is correct?

1. $f(x)=x^2$
2. $\theta (x)=\sqrt{x}\theta$
3. $x$ is odd
4. $\underset{x\to +\mathrm{\infty }}{lim}\frac{3x^2+7x^3}{x^2+5x^4}=3$
5. none of above

Original idea by: Anderson Nogueira Cotrim