Adapted from http://www.xm1math.net/phpmathpublisher/doc/help.html 
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To toggle to the math mode, you must use the <m>…</m> tag. The math commands must be separated by a space character or surrounded by {}.
<m>x in bbR \ { 1; 2 }</m>
Typical commands
x+y : <m>x+y</m>
x-y : <m>x-y</m>
x*y : <m>x*y</m>
x/y : <m>x/y</m>
x^y : <m>x^y</m>
x_y : <m>x_y</m>
x<>y : <m>x<>y</m>
x>y : <m>x>y</m>
x>=y : <m>x>=y</m>
x<y : <m>x<y</m>
x⇐y : <m>x⇐y</m>
(x) : <m>(x)</m>
{x} : <m>{x}</m>
Space
a~b : <m>a~b</m>
Greek:
alpha : <m>alpha</m> beta : <m>beta</m> gamma : <m>gamma</m> delta : <m>delta</m> epsilon : <m>epsilon</m> varepsilon : <m>varepsilon</m> zeta : <m>zeta</m> eta : <m>eta</m> theta : <m>theta</m> vartheta : <m>vartheta</m> iota : <m>iota</m> kappa : <m>kappa</m> lambda : <m>lambda</m> mu : <m>mu</m> nu : <m>nu</m> xi : <m>xi</m> pi : <m>pi</m> varpi : <m>varpi</m> rho : <m>rho</m> varrho : <m>varrho</m> sigma : <m>sigma</m> varsigma : <m>varsigma</m> tau : <m>tau</m> upsilon : <m>upsilon</m> phi : <m>phi</m> varphi : <m>varphi</m> chi : <m>chi</m> psi : <m>psi</m> omega : <m>omega</m> Gamma : <m>Gamma</m> Lambda : <m>Lambda</m> Sigma : <m>Sigma</m> Psi : <m>Psi</m> Delta : <m>Delta</m> Xi : <m>Xi</m> Upsilon : <m>Upsilon</m> Omega : <m>Omega</m> Theta : <m>Theta</m> Pi : <m>Pi</m> Phi : <m>Phi</m>
Symbols:
infty : <m>infty</m>
in : <m>in</m>
notin : <m>notin</m>
forall : <m>forall</m>
exists : <m>exists</m>
notexists : <m>notexists</m>
partial : <m>partial</m>
approx : <m>approx</m>
pm : <m>pm</m>
inter : <m>inter</m>
union : <m>union</m>
ortho : <m>ortho</m>
parallel : <m>parallel</m>
backslash : <m>backslash</m>
prime : <m>prime</m>
wedge : <m>wedge</m>
vert : <m>vert</m>
lbrace : <m>{</m>
rbrace : <m>}</m>
circ : <m>circ</m>
varnothing : <m>varnothing</m>
subset : <m>subset</m>
notsubset : <m>notsubset</m>
cdots : <m>cdots</m>
vdots : <m>vdots</m>
ddots : <m>ddots</m>
Arrows:
left : <m>left</m> right : <m>right</m> leftright : <m>leftright</m> doubleleft : <m>doubleleft</m> doubleright : <m>doubleright</m> doubleleftright : <m>doubleleftright</m> nearrow : <m>nearrow</m> searrow : <m>searrow</m>
Sets:
bbR : <m>bbR</m> bbN : <m>bbN</m> bbZ : <m>bbZ</m> bbC : <m>bbC</m>
Roots and Limits:
sqrt{a} : <m>sqrt{a}</m>
root{n}{a} : <m>root{n}{a}</m>
lim{a}{x} : <m>lim{a}{x}</m>
Big Operators:
int{a}{b}{x} : <m>int{a}{b}{x}</m>
doubleint{a}{b}{x} : <m>doubleint{a}{b}{x}</m>
tripleint{a}{b}{x} : <m>tripleint{a}{b}{x}</m>
oint{a}{b}{x} : <m>oint{a}{b}{x}</m>
sum{a}{b}{x} : <m>sum{a}{b}{x}</m>
prod{a}{b}{x} : <m>prod{a}{b}{x}</m>
bigcup{a}{b}{x} : <m>bigcup{a}{b}{x}</m>
bigcap{a}{b}{x} : <m>bigcap{a}{b}{x}</m>
Delimiters:
delim{[}{x}{]} : <m>delim{[}{x}{]}</m>
delim{]}{x}{]} : <m>delim{]}{x}{]}</m>
delim{[}{x}{[} : <m>delim{[}{x}{[}</m>
delim{]}{x}{[} : <m>delim{]}{x}{[}</m>
delim{lbrace}{x}{rbrace} : <m>delim{lbrace}{x}{rbrace}</m>
delim{|}{x}{|} : <m>delim{|}{x}{|}</m>
delim{vert}{x}{vert} : <m>delim{vert}{x}{vert}</m>
Matrix:
Syntax : matrix{num of lines}{num of columns}{first_element … last_element}
matrix{2}{3}{a b c d e f g} : <m>matrix{2}{3}{a b c d e f g}</m>
Tabular:
Syntax : tabular{lines description}{columns description}{first_element … last_element}
lines : sequence of 1 (draw the horizontal line) or 0 (don't draw the horizontal line) - the length of the sequence=num of lines+1
columns : sequence of 1 (draw the vertical line) or 0 (don't draw the vertical line) - the length of the sequence=num of columns+1
tabular{111}{1111}{a b c d e f g} : <m>tabular{111}{1111}{a b c d e f g}</m>
tabular{1001}{101}{1 2 3 4 5 6} : <m>tabular{1001}{101}{1 2 3 4 5 6}</m>
Constructions:
vec{express} : <m>vec{express}</m>
{express}under{foo} : <m>{express}under{foo}</m>
{express}over{foo} : <m>{express}over{foo}</m>
overline{express} : <m>overline{express}</m>
underline{express} : <m>underline{express}</m>
hat{express} : <m>hat{express}</m>