The formula should be written on a new line in the middle of the manuscript paper. For a long formula that can't be written in one line, it's best to change lines at the equal sign or mathematical symbols (such as+and-), and this symbol should not appear repeatedly at the beginning of the next line.

2. The number of the formula is enclosed in brackets and placed at the end of the right line of the formula, and there is no dotted line between the formula and the number. The formulation may

The serial number can be compiled according to the full text or independently according to the chapter list, such as (49) and (7. 1 1). The serial number should be consistent with the drawing sequence and table sequence in the sketch. Some chapters' formulas are not allowed to be numbered, while others are not. Subformulas need not be numbered, a, b, c, … etc. You can add it when you need a reference. Formulas with repeated references cannot be numbered separately. The serial number of the formula must be continuous, and repetition or omission is not allowed.

3. When quoting formulas in this paper, we can use formula (16.20), not formula 16.20 or formula 16.20.

4. When the numerator and denominator of a fraction are listed in one line and separated by diagonal lines, attention should be paid to avoid ambiguity. For example, a/b cosx can be considered as a/(bcosx) or (a/b)cosx.

5. The horizontal fractional line of the fraction in the formula should be clearly written, especially when the continued fraction (that is, the numerator and denominator also have fractions), and more attention should be paid to the length of the fractional line, and the main fractional line should be aligned with the equal sign.