We can use the existing duplicate checking system to extract formulas from mathematical examples before uploading papers, form independent documents and check duplicates. Because the expression of the formula is unique and specific, we can locate whether there are similar formulas through the duplicate checking system. This can avoid the repeated use and plagiarism of mathematical example formulas. In the early stage, you can use paperfree, papertime and VIP to check the duplicate, and support online duplicate checking.

In addition, we can encode and digitize the formulas in mathematical examples. By converting the formula into numbers or specific symbols, it is easier to check the duplicate. At the same time, by comparing the codes of formulas, the similarity between formulas can be judged quickly and accurately. This method can not only avoid copying formulas, but also promote graduate students' understanding and application ability of formulas in mathematical examples.