在线编辑数学公式

今天在做数据库作业，发现要写公式，在网上找到了一个在线编辑的，就看了下。感觉功能真的是很强。

网址：

http://codecogs.izyba.com/products/eqneditor/editor.php

之后，发现了空格要用转义字符\ 连字符要用\_来表示，同时数据库的作业里面有个nature_join,这个符号用\Join来表示，下面是数学符号的英文代码。

Greek Letters

t1.gif

\alpha               \theta               o                  \tau
\beta                \vartheta           \pi                 \upsilon
\gamma               \gamma              \varpi              \phi
\delta               \kappa              \rho                \varphi
\epsilon             \lambda             \varrho             \chi
\varepsilon          \mu                 \sigma              \psi
\zeta                \nu                 \varsigma           \omega
\eta                 \xi

\Gamma               \Lambda             \Sigma              \Psi
\Delta               \Xi                 \Upsilon            \Omega
\Theta               \Pi                 \Phi

Binary Operation Symbols

t2.gif

\pm                  \cap                \diamond                    \oplus
\mp                  \cup                \bigtriangleup              \ominus
\times               \uplus              \bigtriangledown            \otimes
\div                 \sqcap              \triangleleft               \oslash
\ast                 \sqcup              \triangleright              \odot
\star                \vee                \lhd$^b$                    \bigcirc
\circ                \wedge              \rhd$^b$                    \dagger
\bullet              \setminus           \unlhd$^b$                  \ddagger
\cdot                \wr                 \unrhd$^b$                  \amalg
+                    -

$^b$ Not predefined in a format based on {\tt basefont.tex}.
Use one of the style options
{\tt oldlfont}, {\tt newlfont}, {\tt amsfonts} or {\tt amssymb}.

Relation Symbols

t3.gif

\leq                 \geq                \equiv              \models
\prec                \succ               \sim                \perp
\preceq              \succeq             \simeq              \mid
\ll                  \gg                 \asymp              \parallel
\subset              \supset             \approx             \bowtie
\subseteq            \supseteq           \cong               \Join$^b$
\sqsubset$^b$        \sqsupset$^b$       \neq                \smile
\sqsubseteq          \sqsupseteq         \doteq              \frown
\in                  \ni                 \propto             =
\vdash               \dashv              <                   >
:

$^b$ Not predefined in a format based on {\tt basefont.tex}.
Use one of the style options
{\tt oldlfont}, {\tt newlfont}, {\tt amsfonts} or {\tt amssymb}.

Punctuation Symbols

t4.gif

,            ;           \colon              \ldotp              \cdotp

Arrow Symbols

t5.gif

\leftarrow                   \longleftarrow              \uparrow
\Leftarrow                   \Longleftarrow              \Uparrow
\rightarrow                  \longrightarrow             \downarrow
\Rightarrow                  \Longrightarrow             \Downarrow
\leftrightarrow              \longleftrightarrow         \updownarrow
\Leftrightarrow              \Longleftrightarrow         \Updownarrow
\mapsto                      \longmapsto                 \nearrow
\hookleftarrow               \hookrightarrow             \searrow
\leftharpoonup               \rightharpoonup             \swarrow
\leftharpoondown             \rightharpoondown           \nwarrow
\rightleftharpoons           \leadsto$^b$

$^b$ Not predefined in a format based on {\tt basefont.tex}.
Use one of the style options
{\tt oldlfont}, {\tt newlfont}, {\tt amsfonts} or {\tt amssymb}.

Miscellaneous Symbols

t6.gif

\ldots               \cdots              \vdots              \ddots
\aleph               \prime              \forall             \infty
\hbar                \emptyset           \exists             \Box$^b$
\imath               \nabla              \neg                \Diamond$^b$
\jmath               \surd               \flat               \triangle
\ell                 \top                \natural            \clubsuit
\wp                  \bot                \sharp              \diamondsuit
\Re                  \|                  \backslash          \heartsuit
\Im                  \angle              \partial            \spadesuit
\mho$^b$             .                   |

$^b$ Not predefined in a format based on {\tt basefont.tex}.
Use one of the style options
{\tt oldlfont}, {\tt newlfont}, {\tt amsfonts} or {\tt amssymb}.

Variable-sized Symbols

t7.gif

\sum                 \bigcap             \bigodot
\prod                \bigcup             \bigotimes
\coprod              \bigsqcup           \bigoplus
\int                 \bigvee             \biguplus
\oint                \bigwedge

Log-like Symbols

t8.gif

\arccos     \cos       \csc      \exp      \ker         \limsup      \min      \sinh
\arcsin     \cosh      \deg      \gcd      \lg          \ln	      \Pr       \sup
\arctan     \cot       \det      \hom      \lim         \log	      \sec      \tan
\arg        \coth      \dim      \inf      \liminf      \max	      \sin      \tanh

Delimiters

t9.gif

(                    )                   \uparrow            \Uparrow
[                    ]                   \downarrow          \Downarrow
\{                   \}                  \updownarrow        \Updownarrow
\lfloor              \rfloor             \lceil              \rceil
\langle              \rangle             /                   \backslash
|                    \|

Large Delimiters

t10.gif

\rmoustache        \lmoustache         \rgroup            \lgroup
\arrowvert         \Arrowvert          \bracevert

Math mode accents

t11.gif

\hat{a}            \acute{a}         \bar{a}           \dot{a}           \breve{a}
\check{a}          \grave{a}         \vec{a}           \ddot{a}          \tilde{a}

Some other constructions

t12.gif

\widetilde{abc}                     \widehat{abc}
\overleftarrow{abc}                 \overrightarrow{abc}
\overline{abc}                      \underline{abc}
\overbrace{abc}                     \underbrace{abc}
\sqrt{abc}                          \sqrt
{abc}
$f'$                                \frac{abc}{xyz}