DESIGN OF VARIABLES AND FORMULAS

All variables (in formulas, in the text, or in the picture) must have decryption (explanation) in the text (at the first mention), immediately after the formula in which they are first introduced, or in figure caption. The writing of variables in text, formulas and figures should be the same.

Font for Latin variables is Times New Roman italic (except sin, cos, tg, ctg, min, max, extr, Re, Im). Font for Greek letters is Symbol regular. For Russian letters, numbers and brackets Times New Roman regular is used. Marking of matrices and vectors is done with bold font, vector sign (arrow) is not assigned. The same writing is applied to the upper and lower indices. If the letter or group of letters is not variable, then Times New Roman regular font may be used. In designations like “line AB”, “point O”, “line segment AO” regular font is used because those ones are not considered as variables.

The size of variables in formulas is used in accordance with the size of the main text in the following proportions (the example is given for the font # 12): if the formula is typed in Eqn3.0, the Size tab settings are: Size 12, 9, 8 , 18, 12; if the formula is typed in MathType, the Size tab settings are: Size 12 , 58 % , 42 %, 150 %. 100 %. Scale for variables and formulas when writing them in the MathType editor is 100%. (pt. 2.2 is convenient to check in print and electronic copies simultaneously).

A decimal marker is a full point (decimal point), “minus” sign - short dash, the multiplication sign - × (not x) , the sign of degrees - ° (not O) arrow sign - → (not -> ).

Numbers (variables) presented in scientific notation (with or without mantissa) must use a power of 10 with a superscript, like 10-6; 1∙105; ≈0,5·10–4 ; λD∙10–4, cm (with multiplication sign as dot in the middle after floating point coefficient or variable).

4-digit numbers may be used in 2 formats: with comma separating 3 last digits (like 2,426) and without (like 2426). For numbers with more than 4 digits separating comma is mandatory: 2,386,778. The main rule: the writing must be the same for the entire article, for text and pictures, i.e. if somewhere there are numbers with more than 4 digits, then for all numbers (including 4-digit ones) a comma must be used as a separator for every 3 digits; if numbers with only 4 or less digits are used, then you can insert or not insert a separating comma, but all numbers must be of the same format.