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1 外文字母的书写规则应特别注意外文字母的正斜体,大小写、黑白体和上下角标,容易混淆者应予标明。 1.1 正体用于下列情况:计量单位和用于构成十进倍数的SI词头符号;数学公式中的运算符号和缩写号(如微分号d,偏微分号э,连加号∑,增量符号Δ,极限lim,行列式det等);常数π,e;指数函数、对数函数、三角函数和双曲函数符号;某些特殊函数(如厄米特多项式H_n(x),伽玛函数Г(x)等;非负整数集N,整数集Z,有理数集Q,实数集R,复数集C;化学元素符号;物理量符号中为有别于其他量而加的具有特
A foreign language writing rules should pay special attention to foreign letters are italic, uppercase and lowercase, black and white body and the upper and lower corners, confusion should be marked. 1.1 The body is used in the following cases: Unit of measure and the SI prefix used to form a decimal multiple; Operators and abbreviations in mathematical formulas (such as the differential sign d, the partial semicolon э, the plus sign Σ, the delta sign Δ , Limit lim, determinant det, etc.); constants π, e; exponential functions, logarithmic functions, trigonometric functions and hyperbolic function symbols; special functions such as the Hermitian polynomial H_n (x), gamma function Γ x), etc .; non-negative integer set N, integer set Z, rational number set Q, real number set R, complex number C; chemical element symbols; physical quantity symbols are different from other amounts plus special