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. Generally speaking, an sci paper can have 2-4 first authors, which is the most common.

Generally, most sci journals do not recognize * * * as the first author. If there are too many * * as the first author, the value of the first author will be greatly reduced. Generally, the first author will be the first author by default, followed by the second author and the third author. Even if some publications are marked with * * * as the first author, the publication will be so default, so the author may wish to know whether the publication recognizes * * * as the first author.