F is a vector function L, and its integration path (which is a closed curve) ds represents the differentiation of its integration path, and it is also a product of vector f ds =fx*dx+fy*dy f=fxi+fyj(i j is the unit vector on the x y axis). Generally, it can also be expressed in polar coordinates, which is complicated in form and simple in calculation, so it will not be expressed here. This symbol is often used to mean "feather" and "title" on the Internet.
How to Input Mathematical Symbol∮
Start word2007 first, or double-click the shortcut to start the application. Execute the Insert Symbol command and click the Insert Symbol option to select other symbol options. Then the symbol dialog box pops up, in which the subset selects the mathematical operator option.
Find the mathematical symbol you need below, and then click the Insert button. At this time, you will see such a mathematical symbol in word. Of course, other commonly used symbols in mathematics can also be inserted in the same way.