first post: latex
by @aidanhurwitz
Last updated 2026-07-22 12:02
This is some latex: Let $f$ be integrable on $[a,b]$. Then $|f|$ is integrable on $[a,b]$ and $$\left| \int_a^b f \right| \leq \int_a^b \left| f \right|$$
Definition. Let $X$ be a non-empty set and $(X, \tau)$ be a topological space. A set $A$ is open in $(X, \tau)$ if $A\in\tau$.
In that case, we say that the complement of $A$ in $X$, $A^C$, is closed in $(X, \tau)$.
$$I_3 = \begin{pmatrix}
1&0&0\\
0&1&0\\
0&0&1
\end{pmatrix}$$
~75 words.