created:04-17-2022
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## 希腊字母

$$\Alpha$$ $$\alpha$$ alpha /'ælfə/ 阿尔法（“埃”音更合适）
$$\Beta$$ $$\beta$$ beta /'bi:tə/ 贝塔（“逼塔”发音更合适）
$$\Gamma$$ $$\gamma$$ gamma /'gæmə/ 伽玛
$$\Delta$$ $$\delta$$ delta /'deltə/ 德尔塔
$$\Epsilon$$ $$\epsilon$$ or $$\varepsilon$$ epsilon /'epsilən/ 埃普西隆
$$\Zeta$$ $$\zeta$$ zeta /'ziːtə/ z-塔
$$\Eta$$ $$\eta$$ eta /'iːtə/ 埃塔
$$\Theta$$ $$\theta$$ theta /'θiːtə/ 西塔
$$\Iota$$ $$\iota$$ iota /aɪ'əʊtə/ 埃欧塔
$$\Kappa$$ $$\kappa$$ or $$\varkappa$$ kappa /'kæpə/ 卡帕
$$\Lambda$$ $$\lambda$$ lamda /'læmdə/ 拉姆达
$$\Mu$$ $$\mu$$ mu /'mjuː/
$$\Nu$$ $$\nu$$ nu /'njuː/ 同"妞"
$$\Xi$$ $$\xi$$ xi /'ksaɪ/ 克赛
$$\Omicron$$ $$\omicron$$ omicron /'əʊmɪkrən/ 奥密克戎
$$\Pi$$ $$\pi$$ or $$\varpi$$ pi /'paɪ/
$$\Rho$$ $$\rho$$ or $$\varrho$$ rho /'rəʊ/ 同"肉"
$$\Sigma$$ $$\sigma$$ or $$\varsigma$$ sigma /'sɪgmə/ 西格玛
$$\Tau$$ $$\tau$$ tau /'tɑʊ/
$$\Upsilon$$ $$\upsilon$$ upsilon /'jʊpsɪlən/ 埃普西隆
$$\Phi$$ $$\phi$$ phi /'faɪ/ fai
$$\Chi$$ $$\chi$$ chi /'kaɪ/
$$\Psi$$ $$\psi$$ psi /'psaɪ/
$$\Omega$$ $$\omega$$ omega /'əʊmɪgə/ 欧米伽

## 符号及部分函数名称

$$+$$ plus
$$-$$ minus
$$\pm$$ plus or minus 减价
$$\times$$ multiplied by 乘以
$$/$$ over; divided by 除以
$$÷$$ divided 除以
$$=$$ equals 等于
$$\approx$$ approximately, similar 近似于，与……相似
$$\equiv$$ equivalent to; identical 等价于，等于
$$\neq$$ not equal to 不等于
$$\gt$$ greater than 大于
$$\lt$$ less than 小于
$$\geq$$ greater than or equal to 大于等于
$$\leq$$ less than or equal to 小于等于
$$\ngtr$$ not greater than 不大于
$$\nless$$ not less than 不小于
$$\gg$$ much greater than 远大于
$$\ll$$ much less than 远小于
perpendicular to 垂直于
∣∣ parallel to 平行于
$$\not\equiv$$ not equivalent to, not identical to 不等价于，不等于
$$\not \approx$$ not similar to 与……不相似
$${}^2$$ squared 平方
$${}^3$$ cubed 立方
$${}^4$$ to the fourth; to the power four 四次幂
$${}^n$$ to the n; to the nth; to the power n n次幂
$$\sqrt{}$$ root; square root 平方根
$$\sqrt[3]{}$$ cube root 立方根
$$\sqrt[4]{}$$ fourth root 四次根
$$!$$ factorial 阶乘
% percent 百分之
$$\infty$$ infinity 无穷
$$\propto$$ varies as;proportional to 随……变化，与……成比例
$$\cdot$$ dot
$$\ddot{}$$ double dot 双点
$$:$$ is to, ratio of
f(x) fx f; function 函数
f'(x) f dash; derivative 导数
f''x f double-dash; second derivative 二阶导数
f'''x riple-dash; f treble-dash; third derivative 三阶导数
$$f^{(4)}$$ f four; fourth derivative 四阶导数
$$\partial$$ derivative, delta 偏导数
$$\int$$ integral 积分
$$\sum$$ sum
$$w.r.t.$$ with respect to 对……，相对于……
$$\log$$ log 对数函数
$$\log_2 x$$ log to the base 2 of x 以2为底的对数函数
$$\because$$ because 因为
$$\therefore$$ therefore 所以
$$\to$$ gives, leads to, approaches 得，导致，趋近于
$$/$$ per
$$\in$$ belongs to; a member of;  an element of 属于
$$\notin$$ does not belong to; is not a member of; is not an element of 不属于
$$\subset$$ contained in; a proper subset of 包含
$$\subseteq$$ contained in; subset 包含于……，……的子集
$$\cap$$ intersection 交集
$$\cup$$ union 并集
$$\forall$$ for all 对所有……
$$\cos x$$ cos x; cosine x /kɒz/
$$\sin x$$ sine x /saɪn/
$$\tan x$$ tangent x /tan/
$$\cosec x$$ cosec x /'kəʊsek/
$$\sinh x$$ shine x /'ʃaɪn/
$$\cosh x$$ cosh x /'kɒʃ/
$$\tanh x$$ than x /θæn/
$$\|x\|$$ mod x; modulus x
degrees Fahrenheit 华氏度
°K degrees Kelvin 凯氏度
0°K, –273.15 °C absolute zero 绝对零度
mm millimetre 毫米
cm centimetre 厘米
cc, cm³ cubic centimetre, centimetre cubed 立方厘米
m metre
km kilometre 千米
mg milligram 毫克
g gram 克/
kg kilogram 千克
AC A.C. /eɪ si:/
DC D.C. /di: si:/

## 公式

$$x +1$$ x plus one x加1
$$x-1$$ x minus one x减一
$$x \pm 1$$ x plus orminus one x加减1
$$xy$$ x y;x times y; x multiplied by y xy
$$(x-y)(x + y)$$ x minus y, x plus y x减y乘x加y
$$x/y$$ x over y; x divided by y; x除以y
$$x ÷ y$$ x divided by y x除以y
$$x = 5$$ x equals 5;  x is equal to 5 x等于5
$$x \approx y$$ x is approximately equal to y x约等于y
$$x ≡ y$$ x is equivalent to y; x is identical with y x等价于y,x恒等于y
$$x \neq y$$ x is not equal to y x不等于y
$$x > y$$ x is greater than y x大于y
$$x < y$$ x is less than y x小于y
$$x ≥ y$$ x is greater than or equal to y x大于等于y
$$x ≤ y$$ x is less than or equal to y x小于等于y
$$0 < x < 1$$ zero is less than x is less than 1; x is greater than zero and less than 1 x大于0，小于1
$$0 ≤ x ≤ 1$$ zero is less than or equal to x is less than or equal to 1; x is greater than or equal to zero and less than or equal to 1 x大于等于0，小于等于1
$$x^2$$ x squared x的平方
$$x^3$$ x cubed x的立方
$$x^4$$ x to the fourth;  x to the power four x的四次幂
$$x^n$$ x to the n; x to the nth; x to the power n x的n次幂
$$x^{-n}$$ x to the minus n; x to the power of minus n x的负n次幂
$$\sqrt{}$$ root x; square root x; the square root of x x的平方根
$$\sqrt[3]{}$$ the cube root of x x的立方根
$$\sqrt[4]{}$$ the fourth root of x x的四次根
$$\sqrt[n]{}$$ the nth root of x x的n次根
$$(x + y)^2$$ x plus y all squared x加y整体的平方
$$(x/y)^2$$ x over y all squared y分之x整体的平方
$$n!$$ n factorial; factorial n n的阶乘
x% x percent 百分之x
$$\infty$$ infinity 无穷
$$x \propto y$$ x varies as y; x is (directly) proportional to y x与y成比例
$$x \propto 1/y$$ x varies as one over y; x is indirectly proportional to y x与1/y成比例
$$\dot{x}$$ x dot 点x
$$\ddot{x}$$ x double dot 双点x
$$f(x) \quad fx$$ f of x; the function of x x的函数
f'(x) f dash x; the (first) derivative of with respect to x 函数f对x的导数
f''x f double-dash x; the second derivative of f with respect to x 函数f对x的二阶导数
f'''(x) f triple-dash x; f treble-dash x; the third derivative of f with respect to x 函数f对x的三阶导数
f(4) f four x; the fourth derivative of f with respect to x 函数f对x的四阶导数
$$\partial v$$ the partial derivative of v v的偏微分
$$\frac{\partial v}{\partial \theta}$$ delta v by delta theta, the partial derivative of v with respect to θ v对于θ的偏导数
$$\frac{\partial^2 v}{\partial \theta^2}$$ delta two v by delta theta squared; the second partial derivative of v with respect to θ v对于θ的二阶偏导数
$$\text{d}v$$ the derivative of v v的导数
$$\frac{\text{d}v}{\text{d} \theta}$$ d v by d theta, the derivative of v with respect to theta v对于θ的导数
$$\frac{\text{d}^2 v}{\text{d} \theta^2}$$d d 2 v by d theta squared, the second derivative of vwith respect to theta, v对于θ的二阶导数
$$\int$$ integral 积分
$$\int_0^{\infty}$$ integral from zero to infinity 从0到正无穷的积分
$$\sum$$ sum
$$\sum_{i=1}^n$$ the sum from i equals 1 to n 从i=1到i=n进行求和
$$w.r.t.$$ with respect to 相对于
$$\log_e y$$ or $$\ln$$ log to the base $$e$$ of y; log y to the base $$e$$; natural log (of) y y的自然对数
$$\because$$ because 因为
$$\therefore$$ therefore 所以
$$\to$$ gives, approaches 得，趋近
$$\Delta x \to 0$$ delta x approaches zero $$\Delta x$$趋近于0
$$lim_{\Delta x \to 0}$$ the limit as delta x approaches zero, the limit as delta x tends to zero $$\Delta x$$趋近于0时的极限
$$Lt_{\Delta x \to 0}$$ the limit as delta x approaches zero, the limit as delta x tends to zero $$\Delta x$$趋近于0时的极限
m/sec metres per second 米每秒
$$x \in A$$ x belongs to A; x is a member of A; x is an element of A x属于集合A，x在集合A中
$$x \notin A$$ x does not belong to A; x is not  a member of A; x is not an element of A x不属于集合A
$$A \subset B$$ A is contained in B; A is a proper subset of B B包含A,A是B的真子集
$$A \subseteq B$$ A is contained in B; A is a subset of B B包含A,A是B的子集
$$A \cap B$$ A intersection B A与B的交集
$$A \cup B$$ A union B A与B的并集
$$\cos x$$ cos x; cosine x 余弦
$$\sin x$$ sine x 正弦
$$\tan x$$ tangent x, tan x 正切
$$\cosec x$$ or $$\csc x$$ cosec x 余割
$$\sinh x$$ shine x 双曲正弦
$$\cosh x$$ cosh x 双曲余弦
$$\tanh x$$ than x 双曲正切
$$\|x\|$$ mod x; modulus x x的模
18 ℃ eighteen degrees Centigrade 18摄氏度
70 ℉ seventy degrees Fahrenheit 70华氏度

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