The number of authors depends on how many people participate in the writing of the article. SCI usually has about 2-5 authors and the number of signatories is 5- 10.

Sci papers are very important in academic circles, and it is a great honor to be the author of sci papers, especially the first author. However, after consulting the sci literature, it is found that the number of first authors is not the same, which makes us very confused. I don't know if it is good to arrange several first authors.

The first author of sci papers is the person who has made the greatest contribution to the experiment and writing articles. Refers to the person whose signature ranks first in the author column. But when many people cooperate, it is easy to be like the first author. As for the number of * * * with the first author, there is no clear regulation, which has a lot to do with the workload and length of the paper, the regulations on publishing publications and the recognition of the unit.