LaTeX (pronounced lahhh-tek) is a mathematical markup language that makes it possible to describe math things in plain text and have them automatically rendered to images. For example,
<latex>
F(x,y)=0 ~~\mbox{and}~~
\left| \begin{array}{ccc}
F''_{xx} & F''_{xy} & F'_x \\
F''_{yx} & F''_{yy} & F'_y \\
F'_x & F'_y & 0
\end{array}\right| = 0
</latex>
produces:
See more examples:
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GenericUltranaut - 09 Mar 2020