. Simple block math . $$1+1 = 2$$ .
. No whitespace before and after is fine . foo$1+1 = 2$bar .
foobar
. Even when it starts with a negative sign . foo$-1+1 = 2$bar .foobar
. Shouldn't render empty content . aaa $$ bbb .aaa $$ bbb
. Should require a closing delimiter . aaa $5.99 bbb .aaa $5.99 bbb
. Paragraph break in inline math is not allowed . foo $1+1 = 2$ bar .foo $1+1
= 2$ bar
. Inline math with apparent markup should not be processed . foo $1 *i* 1$ bar .foo bar
. Block math can be indented up to 3 spaces . $$ 1+1 = 2 $$ .. But 4 means a code block . $$ 1+1 = 2 $$ .
$$
1+1 = 2
$$
foo bar
. Multiline display math . $$ 1 + 1 = 2 $$ .. Text can immediately follow inline math . $n$-th order .
-th order
. Display math self-closes at the end of document . $$ 1+1 = 2 .. Display and inline math can appear in lists . * $1+1 = 2$ * $$ 1+1 = 2 $$ .
. Or on multiple lines with expression starting and ending on delimited lines . $$[ [1, 2] [3, 4] ]$$ .
. Escaped delimiters should not render math . Foo \$1$ bar \$\$ 1 \$\$ .
Foo $1$ bar $$ 1 $$
. Numbers can not follow closing inline math . Thus, $20,000 and USD$30,000 won't parse as math. .Thus, $20,000 and USD$30,000 won't parse as math.
. Require non whitespace to right of opening inline math . For some Europeans, it is 2$ for a can of soda, not 1$. .For some Europeans, it is 2$ for a can of soda, not 1$.
. Require non whitespace to left of closing inline math. . I will give you $20 today, if you give me more $ tomorrow. .I will give you $20 today, if you give me more $ tomorrow.
. Inline blockmath is not (currently) registered. . It's well know that $$1 + 1 = 3$$ for sufficiently large 1. .It's well know that $$1 + 1 = 3$$ for sufficiently large 1.
. Escaped delimiters in math mode . Money adds: $\$X + \$Y = \$Z$. .Money adds: .
. Multiple escaped delimiters in math module . Weird-o: $\displaystyle{\begin{pmatrix} \$ & 1\\\$ \end{pmatrix}}$. .Weird-o: .
.