公式必须 \$ 开始 \$ 结束 或\`开始 \`结束 兼容大部分的latex格式，选择你的屏幕大小:
| 输入（选择下面的内容复制到你帖子中即可） |
显示 |
直接输入符号举例：
＋ － ＜ ＝ ＞ ± × ÷ ∈ ∏ ∑ ∕ √ ∝ ∞ ∟ ∠ ∣ ∥ ∧ ∨ ∩ ∪ ∫ ∮
∴ ∵ ∶ ∷ ∽ ≈ ≌ ≒ ≠ ≡ ≤ ≥ ≦ ≧ ≮ ≯ ⊙ ⊥ °℃ ‰ △
Α Β Γ Δ Ε Ζ Η Θ Ι Κ Λ Μ Ν Ξ Ο Π Ρ Σ Τ Υ Φ Χ Ψ Ω
α β γ δ ε ζ η ι κ λ μ ν ξ ο π ρ σ τ υ φ θ ψ ω
⒈ ⒉ ⒊ ⒋ ⒌ ⒍ ⒎ ⒏ ⒐ ⒑ ⒒ ⒓ ⒔ ⒕ ⒖ ⒗ ⒘ ⒙ ⒚ ⒛
⑴ ⑵ ⑶ ⑷ ⑸ ⑹ ⑺ ⑻ ⑼ ⑽ ⑾ ⑿ ⒀ ⒁ ⒂ ⒃ ⒄ ⒅ ⒆ ⒇
Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ Ⅵ Ⅶ Ⅷ Ⅸ Ⅹ Ⅺ Ⅻ ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩
常用数学符号举例：
| \$\pm\$－$\pm$ | \$\mp\$－$\mp$ | \$\times\$－$\times$ | \$\div\$－$\div$ | \$\cdot\$－$\cdot$ |
| \$\cup\$－$\cup$ | \$\cap\$－$\cap$ | \$\circ\$－$\circ$ | \$\sum\$－$\sum$ | \$\prod\$－$\prod$ |
| \$\bigcup\$－$\bigcup$ | \$\bigcap\$－$\bigcap$ | \$\bigodot\$－$\bigodot$ | \$\leftarrow\$－$\leftarrow$ | \$\rightarrow\$－$\rightarrow$ |
| \$\Leftarrow\$－$\Leftarrow$ | \$\Rightarrow\$－$\Rightarrow$ | \$\Leftrightarrow\$－$\Leftrightarrow$ | \$\iff\$－$\iff$ | \$\cdots\$－$\cdots$ |
| \$\forall\$－$\forall$ | \$\exists\$－$\exists$ | \$\emptyset\$－$\emptyset$ | \$\infty\$－$\infty$ | \$\bot\$－$\bot$ |
| \$\angle\$－$\angle$ | \$\neg\$－$\neg$ |
常用数学公式举例：
| 输入 | 显示 | 说明 |
|---|---|---|
| \`x^2+y_1+z_12^34\` \$x^2+y_1+z_{12}^{34}\$ |
`x^2+y_1+z_12^34` $x^2+y_1+z_{12}^{34}$ |
subscripts as in TeX, but numbers are treated as a unit |
| \`sin^-1(x)\` \$\sin^{-1}x\$ |
`sin^-1(x)` $\sin^{-1}x$ |
function names are treated as constants |
| \`d/dxf(x)=lim_(h->0)(f(x+h)-f(x))/h\` | `d/dxf(x)=lim_(h->0)(f(x+h)-f(x))/h` | complex subscripts are bracketed, displayed under lim |
| \$\frac{d}{dx}f(x)=\lim_{h\to 0}\frac{f(x+h)-f(x)}{h}\$ | $\frac{d}{dx}f(x)=\lim_{h\to 0}\frac{f(x+h)-f(x)}{h}$ | standard LaTeX notation is an alternative |
| \`f(x)=sum_(n=0)^oo(f^((n))(a))/(n!)(x-a)^n\` | `f(x)=sum_(n=0)^oo(f^((n))(a))/(n!)(x-a)^n` | f^((n))(a) must be bracketed, else the numerator is only `a` |
| \$f(x)=\sum_{n=0}^\infty\frac{f^{(n)}(a)}{n!}(x-a)^n\$ \$f(x)=\displaystyle{\sum_{n=0}^\infty\frac{f^{(n)}(a)}{n!}(x-a)^n}\$ \$\displaystyle{\prod_{n=1}^{2008}n}=2008!\$ |
$f(x)=\sum_{n=0}^\infty\frac{f^{(n)}(a)}{n!}(x-a)^n$ $f(x)=\displaystyle{\sum_{n=0}^\infty\frac{f^{(n)}(a)}{n!}(x-a)^n}$ $\displaystyle{\prod_{n=1}^{2008}n}=2008!$ |
standard LaTeX produces the same result |
| \`int_0^1f(x)dx\` \$\int_{0}^{1} f(x)dx\$ |
`int_0^1f(x)dx` $\int_{0}^{1} f(x)dx$ |
subscripts must come before superscripts |
| \`[[a,b],[c,d]]((n),(k))\` | `[[a,b],[c,d]]((n),(k))` | matrices and column vectors are simple to type |
| \`x/x={(1,if x!=0),(text{undefined},if x=0):}\` \$\left\{ {\begin{array}{l}x-y=2, \\ x+y=4\times 251. \end{array}} \right.\$ |
`x/x={(1,if x!=0),(text{undefined},if x=0):}` $\left\{ {\begin{array}{l}x-y=2, \\ x+y=4\times 251. \end{array}} \right.$ |
piecewise defined function are based on matrix notation |
| \`a//b\` | `a//b` | use // for inline fractions |
| \`(a/b)/(c/d)\` | `(a/b)/(c/d)` | with brackets, multiple fraction work as expected |
| \`a/b/c/d\` | `a/b/c/d` | without brackets the parser chooses this particular expression |
| \`((a*b))/c\` | `((a*b))/c` | only one level of brackets is removed; * gives standard product |
| \`sqrtsqrtroot3x\` \$\root{3}{x}\$ |
`sqrtsqrtroot3x` $\root{3}{x}$ |
spaces are optional, only serve to split strings that should not match |
| \`(:a,b:) and {:(x,y),(u,v):}\` | `(:a,b:) and {:(x,y),(u,v):}` | angle brackets and invisible brackets |
| \`(a,b]={x in RR : a < x <= b}\` | `(a,b]={x in RR : a < x <= b}` | grouping brackets don't have to match |
| \`abc-123.45^-1.1\` | `abc-123.45^-1.1` | non-tokens are split into single characters, but decimal numbers are parsed with possible sign |
| \`hat(ab) bar(xy) ulA vec v dotx ddot y\` | `hat(ab) bar(xy) ulA vec v dotx ddot y` | accents can be used on any expression (work well in IE) |
| \`bb{AB3}.bbb(AB].cc(AB).fr{AB}.tt[AB].sf(AB)\` | `bb{AB3}.bbb(AB].cc(AB).fr{AB}.tt[AB].sf(AB)` | font commands; can use any brackets around argument |
| \`stackrel"def"= or \stackrel{\Delta}{=}" "("or ":=)\` | `stackrel"def"= or \stackrel{\Delta}{=}" "("or ":=)` | symbols can be stacked |
| \`{::}_(\ 92)^238U\` | `{::}_(\ 92)^238U` | prescripts simulated by subsuperscripts |
(Copy and paste the following lines to see what symbols they
produce)
You can use the following ASCIIMathML constructs:
\$(x+1)/(x-1) x^(i+j) x_(ij) sqrt(x) root(n)(x) stackrel(+)(->) text(any)
"any"\$
Operation symbols \$+ - * ** // \\ xx -: @ o+ ox sum
prod ^^ ^^^ vv vvv nn nnn uu uuu\$
Relation symbols \$= !=
< <= > >= -< >- in !in sub sup sube supe -= ~= ~~
prop\$
Logical symbols \$and or not => if iff AA EE _|_ TT
|- |=\$
Miscellaneous symbols \$int oint del grad +- O/ oo
aleph ... cdots \ quad qquad diamond square |_ _| |~ ~| CC NN QQ RR
ZZ\$
Standard functions \$sin cos tan csc sec cot sinh cosh
tanh log ln det dim lim mod gcd lcm\$
Grouping brackets \$( )
[ ] { } (: :) {: :}\$ Arrows\$uarr darr rarr -> larr harr
rArr lArr hArr\$
Accents \$hatx barx ulx vecx dotx
ddotx\$ Font commands\$bbA bbbA ccA ttA frA sfA\$
Matrices\$[[a,b],[c,d]] ((1,0),(0,1))\$
Greek
letters \$alpha beta chi delta Delta epsi eta gamma Gamma iota kappa
lambda Lambda mu nu omega Omega phi Phi pi Pi psi rho sigma Sigma tau theta
Theta upsilon xi Xi zeta\$