hot key:
Formula editing: alt+"+"
Superscript: x^i + space
Subscript: x_i + space
Real number R: \doubleR + space
Partial differential operator: "\partial"
Limit: "\limit" (pressing the space will display a long string of formulas, and then the space will become a mathematical formula)
Integral: "\int"
Double integral: "\iint"
Triple integral: "\iiint"
Sum: "\Sigma", note that S is capitalized here, and the lowercase sigma is "σ"
Gradient operator (inverted triangle): "\nabla"
Dot product (eg inner product): "\bullet"
Cross product (e.g. outer product, curl): "\times"
The vector arrow above the letter: "\hvec", if a is a vector, use "a\hvec", note that there are two spaces
Root sign: "\sqrt"
Fraction: "/", press the space after typing, it will become the upper and lower format
Formula equal sign alignment:
After the input of the first line is completed, shift + enter to enter the next line, right click before the "=" in the first line, and select to align at this character, similarly, do the same before the "=" in the second line, and it's ok
