Solo, co-authorship and compilation are all ways of writing. A solo work is a work created by one person independently. If a paper has a first author, a second author and a third author, it is a co-author, not a single article. So there can only be 1 authors. If a book has an editor-in-chief, deputy editor-in-chief, editorial board, etc. It shows that this book was not written by one person independently, so it can't be called a solo work.

Co-authorship is a book written by several people, and the co-author is the owner of the book. A co-author can have up to 3 authors. Solo and co-writing are a pair of words.

Compilation refers to compiling and cataloging, that is, sorting out existing materials and their own research results into books or articles. Basically, they are all written, but they have independent opinions, or supplement some personal research and findings. That is to say, the quotation in the author's works has constituted the substantial use of the existing works, or contains the elements of collecting or rewriting the existing works, and the author's creative behavior should be recognized as assembly.