Math Notation Help

This glossary will help you build complex mathematical equations using the Tex markup language. This will involve using @@ or $$before and after the expression to display the desired results. Browse the glossary using this index Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ALL Page: 1 2 3 4 5 6 7 8 9 10 ... 12 (Next) ALL \ \_ (where _ is blank) • Ordinary whitespace to be used after a dot not denoting the end of a sentence • After commands without parameters use \~ (tilde) instead in order to avoid browser specific problems  Keyword(s): math spaces, whitespace, blank space \, • \, inserts the smallest predefined space in a formula • Equivalent: \hspace{2} • Ex.:$$a\,b$$gives $a\,b$ • Ex.:$$a~\hspace{2}~b$$gives also $a~\hspace{2}~b$  Keyword(s): math spaces \; • \; (backslash semicolon) inserts the third smallest predefined space in a formula • Equivalent: \hspace{6} • Ex.:$$a\;b$$gives $a\;b$ • Ex.:$$a~\hspace{6}~b$$gives also $a~\hspace{6}~b$  Keyword(s): math spaces \: • \: inserts the second smallest predefined space in a formula • Equivalent: \hspace{4} • Ex.:$$a\:b$$gives $a\:b$ • Ex.:$$a~\hspace{4}~b$$gives also $a~\hspace{4}~b$  Keyword(s): math spaces \/ (backslash slash) • \/ (backslash slash) avoids ligatures • Ex.:$$V\/A$$gives $V\/A$ in contrast to$$VA$$which gives $VA$  Keyword(s): math spaces, ligature \~ • In order to prevent some browser specific problems with whitespaces, it is advisable to use ~ (tilde) as the whitespace instead of the normal blank key (in places where whitespaces are mandatory, e.g. after commands). • Ex.:$$\frac~xy$$to produce $\frac~xy$ • Ex.:$$\sqrt~n$$to produce $\sqrt~n$  Keyword(s): blank space, blank key, required whitespace \hspace{n} • inserts a space of n pixels • Ex.:$$f(x)\hspace{6}=\hspace{6}0$$gives $f(x)\hspace{6}=\hspace{6}0$ • can be combined with the preceding command \unitlength{m}(default: m=1px) , which defines the applied unit • Ex.:$$\unitlength{20}a\hspace{2}b$$gives $\unitlength{20}a\hspace{2}b$ , i.e. a space of 20x2=40px  Keyword(s): math spaces \LARGE (all capital letters) • Everthing following the \LARGE command will be output in the largest predefined font size until the system encounters another font size command. • Note: This command is case sensitive, since large, Large and LARGE are different sizes! • Ex.:$$\LARGE~3x$$gives $\LARGE~3x$  Keyword(s): font size, \Large (L capital letter) • Everthing following the \Large command will be output in the second largest font size until the system encounters another font size command. • Note: This command is case sensitive, since large, Large and LARGE are different sizes! • Ex.:$$\Large~3x$$gives $\Large~3x$  Keyword(s): font size, \large (all lower case letters) • Everthing following the \large command will be output in the large font size until the system encounters another font size command. • Note: This command is case sensitive, since large, Large and LARGE are different sizes! • Ex.:$$\large~3x$$gives $\large~3x$  Keyword(s): font size, fs{3} \normalsize • Everthing following the \normalsize command will be output in the smallest predefined font size until the system encounters another font size command. • \normalsize is the default font size, i.e. the size automatically chosen if there is no font size command • Ex.:$$\normalsize~3x$$gives $\normalsize~3x$  Keyword(s): font size, \qquad • inserts a double space of current character set size • Ex.:$$a\qquad~b$$gives $a\qquad~b$  Keyword(s): math space \quad • inserts a space of current character set size • Ex.:$$a\quad~b$$gives $a\quad~b$  Keyword(s): math spaces \small • \small • Ex.:$$\small~3x$$gives $\small~3x$  Keyword(s): font size, \tiny • Everthing following the \tiny command will be output in the smallest predefined font size until the system encounters another font size command. • Ex.:$$\tiny~3x$$gives $\tiny~3x$  Keyword(s): font size, A absolute font sizes (overview)  Absolute Font Sizes Command Example Result \tiny$$\tiny 3x$$$\tiny 3x$ \small$$\small 3x$$$\small 3x$ \normalsize (default)$$\normalsize 3x$$or just$$3x$$$\normalsize 3x$ \large$$\large 3x$$$\large 3x$ \Large$$\Large 3x$$$\Large 3x$ \LARGE$$\LARGE 3x$$$\LARGE 3x$ \huge and \Huge are not supported by the mimeTeX filter algebraic expression using @@@ x=y^2@@@ to create @@ x=y^2@@  Keyword(s): algebra alpha (lower case greek letter)$$\alpha$$gives $\alpha$ angle bracket • Syntax: \left<...\right> • Ex.:$$\left<f,g\right>$$gives $\left$ arithmetic operations • Type arithmetic operations and "=" as usual. • Exp.:$$f(x)=x-2b+(3a/c)$$gives $f(x)=x-2b+(3a/c)$ • See also keyword "fraction" for extended capabilities. array$$\begin{array}{|ccc|}a_1&a_2&a_3\\ b_1&b_2&b_3\\ c_1&c_2&c_3\end{array}$$is $\begin{array}{|ccc|}a_1&a_2&a_3\\ b_1&b_2&b_3\\ c_1&c_2&c_3\end{array}$  Keyword(s): array B beta (lower case greek letter)$$\beta$$gives $\beta$ big sum$$\bigsum_{n+2}^x$$is $\bigsum_{n+2}^x$ braces • Syntax: \left{...\right} • Ex.:$$M=\left{a, b, c\right}$$gives $M=\left{a, b, c\right}$ C cdot (multiplication)$$a\cdot~b$$gives $a\cdot~b$ chi (lower case greek letter)$$\chi$$gives $\chi$ constants • Numbers in formulas are interpreted as constants and they are rendered in non-italic roman font face, which is a widely used convention. • Following this convention, variables are shown in italic. • Exp.:$$f(x)=3a+x$$gives $f(x)=3a+x$ contour integral • General syntax for symbols with a kind of lower and upper limits: \symbolname_{lowerexpression}^{upperexpression} • In general, there are two ways how these lower and upper expressions can be placed: centered below and above the symbol or in a subscript / superscript manner. In the first case the symbol name is preceded by the word "big", in the second there is no prefix. • Syntax for the contour integral symbol:$$\bigoint_{0}^{\infty}$$gives $\bigoint_{0}^{\infty}$ and$$\oint_{0}^{\infty}$$gives $\oint_{0}^{\infty}$ • Use font size commands for a nicer picture:$$\LARGE\bigoint_{\small0}^{\small\infty}$$gives $\LARGE\bigoint_{\small0}^{\small\infty}$ and$$\large\oint_{\small0}^{\small\infty}$$gives $\large\oint_{\small0}^{\small\infty}$ coproduct • General syntax for symbols with a kind of lower and upper limits: \symbolname_{lowerexpression}^{upperexpression} • In general, there are two ways how these lower and upper expressions can be placed: centered below and above the symbol or in a subscript / superscript manner. In the first case the symbol name is preceded by the word "big", in the second there is no prefix. • Note: mimeTeX seems currently only to support the \bigcoprod command. • Syntax for coproduct symbol:$$\bigcoprod_{i=k}^{n}$$gives $\bigcoprod_{i=k}^{n}$ • Use font size commands for a nicer picture:$$\LARGE\bigcoprod_{\small{i=k}}^{\small~n}$$gives $\LARGE\bigcoprod_{\small{i=k}}^{\small~n}$  Keyword(s): coprod D delimiters (overview)  Delimiters (parentheses, braces, brackets. ...) Command Example Result \left(... \right)$$2\left(a+b\right)$$$2~\left(a+b\right)$ \left[... \right]$$\left[a^2+b^2~\right]$$$\left[a^2+b^2~\right]$ \left{... \right}$$\left{x^2, x^3, x^4,... \right}$$$\left{x^2, x^3, x^4,... \right}$ \left\langle... \right\rangle$$\left\langle a,b~\right\rangle$$$\left\langle a,b~\right\rangle$ \left| ... \right|$$\det\left|\array{a&b\\c&d}\right| $$$\det\left|\array{a&b\\c&d}\right|$ \left\| ... \right\|$$\left\|f~\right\|$$$\left\|f~\right\|$ \left{ ... \right.(note the dot!)$$f(x)=\left{{x^2, \rm~if x>-1\atop~0, \rm~else}\right.$$(\rm switches to roman style) $f(x)=\left{{x^2, \rm~if x>-1\atop~0, \rm~else}\right.$ \left.{ ... \right\}(note the dot!)$$\left.{{\rm~term1\atop\rm~term2}\right}=y$$$\left.{{\rm~term1\atop \rm~term2}\right}=y$ Note: The delimiters are automatically sizes. delta$$\delta$$is $\delta$  Keyword(s): delta Delta (upper case greek letter)$$\Delta$$gives $\Delta$ delta (lower case greek letter)$$\delta$$gives $\delta$  Keyword(s): delta div (division)$$x\div~y$$gives $x\div~y$ division @@@1/2@@@ is @@1/2@@  Keyword(s): division/ double vertical line (norm symbol) • Syntax: \left\|...\right\| • Exp.:$$\left\|af\right\| = \left|a\right|\left\|f\right\|$$gives $\left\|af\right\| = \left|a\right|\left\|f\right\|$  Keyword(s): norm E epsilon (lower case greek letter)$$\epsilon$$gives $\epsilon$ equals @@@x=2@@@ is @@x=2@@  Keyword(s): =equals escaping the TeX filter • With two triple 's embracing an expression you can make the filter to escape and the code itself is shown (with two embracing double 's). • Ex.:$$a^2$$produces$$a^2$$, i.e. prevents the filter to render it as a formula gif.  Keyword(s): escape; suppress filter; prevent from filtering eta (lower case greek letter)$$\eta$$gives $\eta$ F formula box$$\fbox{x=\frac12}$$is $\fbox{x=\frac12}$  Keyword(s): fbox fraction$$$\frac1{1-x}$$$is$$$\frac1{1-x}$$$ Keyword(s): fraction G gamma (lower case greek letter)$$\gamma$$gives $\gamma$ Gamma (upper case greek letter)$$\Gamma$$gives $\Gamma$ greater than @@@x>y@@@ is @@x>y@@  Keyword(s): greater than> greater than or equal$$x\ge~y$$or$$x\geq~y$$gives $x\ge~y$  Keyword(s): >= greek letters (overview) Simply write \greekletter for lower case and \Greekletter for upper case. Here's a list of all known greek letters (Note: not all upper case greek letters are known): Lower Case Greek Letters:  Command Filter Expression Result \alpha$$\alpha$$$\alpha$ \beta$$\beta$$$\beta$ \gamma$$\gamma$$$\gamma$ \delta$$\delta$$$\delta$ \epsilon$$\epsilon$$$\epsilon$ \varepsilon$$\varepsilon$$$\varepsilon$ \zeta$$\zeta$$$\zeta$ \eta$$\eta$$$\eta$ \theta$$\theta$$$\theta$ \vartheta$$\vartheta$$$\vartheta$ \iota$$\iota$$$\iota$ \kappa$$\kappa$$$\kappa$ \lambda$$\lambda$$$\lambda$ \mu$$\mu$$$\mu$ \nu$$\nu$$$\nu$ \xi$$\xi$$$\xi$ o (!)$$o$$$o$ \pi$$\pi$$$\pi$ \varpi$$\varpi$$$\varpi$ \rho$$\rho$$$\rho$ \varrho$$\varrho$$$\varrho$ \sigma$$\sigma$$$\sigma$ \varsigma$$\varsima$$$\varsigma$ \tau$$\tau$$$\tau$ \upsilon$$\upsilon$$$\upsilon$ \phi$$\phi$$$\phi$ \varphi$$\varphi$$$\varphi$ \chi$$\chi$$$\chi$ \psi$$\psi$$$\psi$ \omega$$\omega$$$\omega$ Upper Case Greek Letters:  Command Filter Expression Result \Gamma$$\Gamma$$$\Gamma$ \Delta$$\Delta$$$\Delta$ \Theta$$\Theta$$$\Theta$ \Lambda$$\Lambda$$$\Lambda$ \Xi$$\Xi$$$\Xi$ \Pi$$\Pi$$$\Pi$ \Sigma$$\Sigma$$$\Sigma$ \Upsilon$$\Upsilon$$$\Upsilon$ \Phi$$\Phi$$$\Phi$ \Psi$$\Psi$$$\Psi$ \Omega$$\Omega$$$\Omega$ I infinity$$\infty$$is $\infty$  Keyword(s): infinity integral • General syntax for symbols with a kind of lower and upper limits: \symbolname_{lowerexpression}^{upperexpression} • In general, there are two ways how these lower and upper expressions can be placed: centered below and above the symbol or in a subscript / superscript manner. In the first case the symbol name is preceded by the word "big", in the second there is no prefix. • Syntax for integral symbol:$$\bigint_{0}^{\infty}$$gives $\bigint_{0}^{\infty}$ and$$\int_{0}^{\infty}$$gives $\int_{0}^{\infty}$ • Use font size commands for a nicer picture:$$\LARGE\bigint_{\small0}^{\small\infty}$$gives $\LARGE\bigint_{\small0}^{\small\infty}$ and$$\large\int_{\small0}^{\small\infty}$$gives $\large\int_{\small0}^{\small\infty}$  Keyword(s): int iota (lower case greek letter)$$\iota$$gives $\iota$ K kappa$$\kappa$$gives $\kappa$ L lambda (lower case greek letter)$$\lambda$$gives $\lambda$ Lambda (upper case greek letter)$$\Lambda$$gives $\Lambda$ Learning Formula $\frac{success}{problem}=~\unitlength{.6}~\picture(100){~~(50,50){\circle(99)}~ ~(20,55;50,0;2){+1\hat\bullet}~~(50,40){\bullet}~~(50,35){\circle(50,25;34)}~ ~(50,35){\circle(50,45;34)}}$  Keyword(s): learning formula left only brace • Syntax: \left{...\right. (note the dot at the end!) • Ex.:$$f(x)=\left{{x^2, \rm~if x>-1\atop~0, \rm~else}\right.$$gives $f(x)=\left{{x^2, \rm~if x>-1\atop~0, \rm~else}\right.$ (\rm~something switches to roman style) less than$$<$$is $<$  Keyword(s): less than< less than or equal$$x\le~y$$or$$x\leq~y$$gives $x\le~y$  Keyword(s): <= M math spaces List of predefined spaces:  Math Spaces Command Example Result \, (smallest predefined)$$a\,b$$$a\,b$ \: (second smallest predefined)$$a\:b$$$a\:b$ \; (third smallest predefined)$$a\;b$$$a\;b$ \/ (avoiding ligatures)$$V\/A$$instead of$$VA$$$V\/A$ instead of $VA$ \quad (space of current character set size)$$a\quad~b$$$a\quad~b$ \qquad (double space of current character set size)$$a\qquad~b$$$a\qquad~b$ \_ (where _ is blank!)$$a\ b$$(whereas$$a\b$$is not a valid filter expression since the blank space is missing; it is recommended to use the tilde ~ instead of the simple whitespace) $a\ b$ \hspace{n} ,where n positive integer (= n Pixels)$$a~\hspace{30}~ba~\hspace{15}~ba~\hspace{2}~ba~\hspace{1}~b$$$a~\hspace{30}~b$$a~\hspace{15}~b$$a~\hspace{2}~b$$a~\hspace{1}~b$ \unitlength{m}\hspace{n}, changes the default unit length (m=1px) to be applied$$a~\hspace{2}~b\unitlength{10}~\hspace{2}~c$$(second space is 10x2=20px) $a~\hspace{2}~b\unitlength{10}~\hspace{2}~c$ Note: Simple blank spaces and tildes (~) are ignored by the TeX filter and don't produce any space. You must use one of the defined math spaces to get a visible (extra) space.  Keyword(s): spaces in formulas, predefined spaces mathematics expression • A valid expression inside the 's is rendered as mathematics in an inserted gif image. • Ex.:$$x=y^2$$creates $x=y^2$  Keyword(s): mathematics expression matrix • An (m,n)-matrix is considered as an array of m*n elements, where the elements of a column are separated by "&" and the rows by "\\". • Syntax for an (m,n)-matrix: \begin{array}{colformat}a11&...&a1n\\a21&...&a2n\\... \\am1&...&amn \end{array} where colformat defines the format of each of the n columns: l for left, r for right and c for center (hence {ccccc} defines for a (m,5)-matrix in which all columns are centered) • Ex.:$$\left(\begin{array}{lcr}a_{\tiny1}+d & a_{\tiny2}+d & a_{\tiny3}+d \\ b_{\tiny1}& b_{\tiny2}& b_{\tiny3} \\ c_{\tiny1} & c_{\tiny2} & c_{\tiny3} \end{array}\right)gives $\left(\begin{array}{lcr}a_{\tiny1}+d & a_{\tiny2}+d & a_{\tiny3}+d \\ b_{\tiny1}& b_{\tiny2}& b_{\tiny3} \\ c_{\tiny1} & c_{\tiny2} & c_{\tiny3} \end{array}\right)$ Note in the example above that "lcr" has the effect that column 1 is left aligned, column 2 centered and colums 3 right aligned.  Keyword(s): matrix, array minus-$$is $-$  Keyword(s): -minus minus plus$$\mp~a$$gives $\mp~a$ mu (lower case greek letter)$$\mu$$gives $\mu$ multiplication$$x*y=z$$is $x*y=z$  Keyword(s): multiplicationmultiply multiplication (with cdot)$$a\cdot~b$$gives $a\cdot~b$  Keyword(s): cdot N not equal @@@x<>y@@@ is @@x<>y@@  Keyword(s): <> nu (lower case greek letter)$$\nu$$gives $\nu$ O omega (lower case greek letter)$$\omega$$gives $\omega$ Omega (upper case greek letter)$$\Omega$$gives $\Omega$ omikron (lower case greek letter)$$o$$gives $o$ (note this exceptional syntax!) P parentheses • Syntax: \left(...\right) or $...$ • Ex.:$$2a\left(b+c\right)$$gives $2a\left(b+c\right)$ phi (lower case greek letter)$$\phi$$gives $\phi$ Phi (upper case greek letter)$$\Phi$$gives $\Phi$ pi$$x=\pi r^2$$is $x=\pi r^2$  Keyword(s): pi pi (lower case greek letter)$$\pi$$gives $\pi$ Pi (upper case greek letter)$$\Pi$$gives $\Pi$ plus$$+$$is $+$  Keyword(s): +plus plus minus$$a\pm~b$$gives $a\pm~b$ product • General syntax for symbols with a kind of lower and upper limits: \symbolname_{lowerexpression}^{upperexpression} • In general, there are two ways how these lower and upper expressions can be placed: centered below and above the symbol or in a subscript / superscript manner. In the first case the symbol name is preceded by the word "big", in the second there is no prefix. • Syntax for product symbol:$$\bigprod_{i=k}^{n}$$gives $\bigprod_{i=k}^{n}$ and$$\prod_{i=k}^{n}$$gives $\prod_{i=k}^{n}$ • Use font size commands for a nicer picture:$$\LARGE\bigprod_{\tiny{i=k}}^{\tiny{n}}$$gives $\LARGE\bigprod_{\tiny{i=k}}^{\tiny{n}}$ and$$\large\prod_{\small{i=k}}^{\small{n}}$$gives $\large\prod_{\small{i=k}}^{\small{n}}$ psi (lower case greek letter)$$\psi$$gives $\psi$ Psi (upper case greek letter)$$\Psi$$gives $\Psi$ R relativity $E=mc^2$  Keyword(s): relativity rho (lower case greek letter)$$\rho$$gives $\rho$ right only brace • Syntax: \left.{...\right} (note the dot!) • Ex.:$$\left.{{\rm~term1\atop\rm~term2}\right}=y$$gives $\left.{{\rm~term1\atop\rm~term2}\right}=y$ (\rm~something switches to roman style) root • Syntax: \sqrt[n]{arg} or simply \sqrt{arg} for \sqrt{arg} • Ex.:$$\sqrt{8}$$gives $\sqrt{8}$ • Ex.:$$\sqrt{-1}$$gives $\sqrt{-1}$ • Nesting of roots (and combining with fractions, ...etc.) are possible. • Ex.:$$\sqrt[n]{\frac{x^n-y^n}{1+u^{2n}}}$$gives $\sqrt[n]{\frac{x^n-y^n}{1+u^{2n}}}$ • Ex.:$$\sqrt{-q+\sqrt{q^2+p^3}}$$gives $\sqrt{-q+\sqrt{q^2+p^3}}$  Keyword(s): square root S s.u.m$$\sum_{n+2}^x$$is $\sum_{n+2}^x$  Keyword(s): sum sigma (lower case greek letter)$$\sigma$$gives $\sigma$ Sigma (upper case greek letter)$$\Sigma$$gives $\Sigma$ smiley$$~\unitlength{.6}~\picture(100){~~(50,50){\circle(99)}~ ~(20,55;50,0;2){+1\hat\bullet}~~(50,40){\bullet}~~(50,35){\circle(50,25;34)}~ ~(50,35){\circle(50,45;34)}}$$is $~\unitlength{.6}~\picture(100){~~(50,50){\circle(99)}~ ~(20,55;50,0;2){+1\hat\bullet}~~(50,40){\bullet}~~(50,35){\circle(50,25;34)}~ ~(50,35){\circle(50,45;34)}}$  Keyword(s): smiley square bracket • Synatx: \left[...\right] • Ex.:$$\left[a,b\right]$$gives $\left[a,b\right]$ square root @@@sqrt{x}@@@ is @@sqrt(x)@@  Keyword(s): sqr rt subscript underscore$$x_2$$is $x_2$  Keyword(s): subscript_ sum (summation) • General syntax for symbols with a kind of lower and upper limits: \symbolname_{lowerexpression}^{upperexpression} • In general, there are two ways how these lower and upper expressions can be placed: centered below and above the symbol or in a subscript / superscript manner. In the first case the symbol name is preceded by the word "big", in the second there is no prefix. • Syntax for summation symbol:$$\bigsum_{i=k}^{n}$$gives $\bigsum_{i=k}^{n}$ and$$\sum_{i=k}^{n}$$gives $\sum_{i=k}^{n}$ • Use font size commands for a nicer picture:$$\LARGE\bigsum_{\small{i=1}}^{\small{n}}$$gives $\LARGE\bigsum_{\small{i=1}}^{\small{n}}$ and$$\large\sum_{\small{i=1}}^{\small{n}}$$gives $\large\sum_{\small{i=1}}^{\small{n}}$  Keyword(s): big sum superscript$$x^2$$or$$x^3$$is $x^2$ or $x^3$  Keyword(s): superscript^ T tau (lower case greek letter)$$\tau$$gives $\tau$ TeX $TeX$ notation allows for the expression of ASCII characters to generate formatted graphics output  Keyword(s): TeX theta (lower case greek letter)$$\theta$$gives $\theta$ Theta (upper case greek letter)$$\Theta$$gives $\Theta$ times$$a\times~b$$gives $a\times~b$ triangle$$\Delta$$is $\Delta$  Keyword(s): triangle triggering the TeX filter • Two double 's embracing a valid math expression trigger the filter to generate and insert the formula gif. • Ex.:$$a^2$$produces $a^2$  Keyword(s): trigger, TeX filter, start filter U upsilon (lower case greek letter)$$\upsilon$$gives $\upsilon$ Upsilon (upper case greek letter)$$\Upsilon$$gives $\Upsilon$ V varepsilon (special lower case greek letter)$$\varepsilon$$gives $\varepsilon$ variables • Variables in formulas are rendered in italic roman font face, which is a widely used convention. • Following this convention, constants are shown as non-italic. • Exp.:$$f(x)=3a+x$$gives $f(x)=3a+x$ varphi (special lower case greek letter)$$\varphi$$gives $\varphi$ varpi (special lower case greek letter)$$\varpi$$gives $\varpi$ varrho (special lower case greek letter)$$\varrho$$gives $\varrho$ varsigma (special lower greek letter)$$\varsigma$$gives $\varsigma$ vartheta (special lower case greek letter)$$\vartheta$$gives $\vartheta$ vertical line (absolute value, determinant, ...etc. symbol) • Syntax: \left|...\right| • Ex.:$$\left|b-a\right|$$gives $\left|b-a\right|$ • Ex.:$${\rm~det}\left|\begin{array}{cc}a&b\\c&d \end{array}\right|$$gives ${\rm~det}\left|\begin{array}{cc}a&b\\c&d \end{array}\right|$ ("\rm~something" renders "something" in roman style)  Keyword(s): absolute value symbol, determinant symbol X xi (lower case greek letter)$$\xi$$gives $\xi$ Xi (upper case greek letter)$$\Xi$$gives $\Xi$ Z zeta (lower case greek letter)$$\zeta gives $\zeta$

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