# Sample 1

This is fancy.

 Hello world! Something else.

$$\int_0^\infty e^{-x} dx$$ This works fine

Note. $1+1=2$ If I give a name or number to the parameter, math comes out just fine. However, it bothers me that I cannot put two separate paragraphs inside a note.
I'm not sure why, but putting a line with a colon in between seems to separate paragraphs for templates.
Note. You mean
like
this? (Note two consecutive colons don't create more space)

Sketch of the proof.

# Sample 2: Inline references

This is a citation.[1] And also this ones. [2] [3]

# Sample Picture

This is an image of the file File:Matias.jpg

## References

1. Gilbarg, David; Trudinger, Neil S. (2001), Elliptic partial differential equations of second order (2nd ed.), Berlin, New York: Springer-Verlag, ISBN 978-3-540-41160-4
2. Yang, Ray (2013), "Optimal Regularity and Nondegeneracy of a Free Boundary Problem Related to the Fractional Laplacian", Arch. Ration. Mech. Anal. 208: 693--723, doi:10.1007/s00205-013-0619-7, ISSN 0003-9527
3. Evans, Lawrence C. (1998), Partial differential equations, Graduate Studies in Mathematics, 19, American Mathematical Society, pp. xviii+662