1. 1 All units of measurement and prefix symbols
Units of measurement, such as: m (meter), s (second), v (volt), ω (euro), c (degree Celsius), eV (electron volt), mol (mole), etc. Prefixes such as: K (thousands), G (Kyrgyzstan), M (trillions), etc.
1.2 operation symbols, abbreviated numbers, special function symbols, etc. In mathematical expressions.
(1) operation symbol. Such as: ∑ (continuous addition), II (continuous multiplication), D (differential),? (partial differential), △ (finite increment), etc.
(2) Abbreviations, such as min (minimum), sup (supremum), lim (limit), im (imaginary part), det (determinant), t or t (transposed symbol), etc.
(3) Special constant symbol.
(4) Symbols of exponential, logarithmic, trigonometric and hyperbolic functions. Such as exp (exponential function), In (natural logarithm), cos (cosine), arctan (arc tangent), sinh (hyperbolic sine), arcsch (anti-hyperbolic cotangent) and so on.
1.3 The lower corner of the non-quantity symbol is distinguished from other quantities by adding a specific meaning to the quantity symbol.
1.4 chemical element symbol
1.5 model instruments, components, samples, etc.
1.6 Names of Latin scientific names and scientific names of subfamilies and above in biology.
1.7 stands for Latin letters of serial numbers.
Second, foreign language italics
Italic foreign letters are mainly used in the following situations:
2. 1 Numbers expressed by letters and general functions in mathematics
For example: x, y, z, b, F(t), etc. Letters representing points, lines, faces and figures are also italicized. For example: point P, △ABC, etc.
2.2 Quantity symbol and the lower corner symbol representing quantity and variable numbers in the quantity symbol.
2.3 Vector sum tensor