1, the first author is the signature of the paper, and the second and third authors are the second and third authors. Generally speaking, it depends on the weight of your article. If the weight is enough, you can publish multiple authors. An article in a foreign multi-center clinical trial can reach 100 people.

2. An article generally has a correspondent, and the correspondent refers to the owner and director of the article. Someone else has a correspondent, which means contact.

3. The ranking can also be determined by both parties through consultation. If there is no agreement, generally the first author ranks first, the second author ranks second, and so on.

Extended data:

On the signature of innovative works, such as scientific research papers, patents, research reports, etc. The name of the person who has made the greatest contribution to the work is usually signed at the front.

Especially for the signature of scientific research papers, each journal has more detailed regulations; However, when the paper signature is used to evaluate professional titles, the weight of the first author is obviously heavier than that of the second and third authors, but lighter than the personal signature.

Due to the complexity and diversity of scientific research, for example, hundreds of people sign a paper in bioinformatics. The first author refers to the person whose signature ranks first. Some articles have two or more first authors, which are called tied first authors. In this case, it is generally necessary to indicate the name of the person.

In addition, the first author is different from the correspondent and creative contribution, and the correspondent is often the most authoritative person in the field of papers.

References:

Baidu Encyclopedia-First Author