Hyphens, En Dashes, Em Dashes
Q. In mathematics it is common to refer to an important construction or theorem due to several authors by joining their names together with hyphens. For example, one often refers to the Cartan-Eilenberg spectral sequence for the spectral sequence of Cartan and Eilenberg. There seems to be room for confusion when an author’s name is already hyphenated. For example, some authors refer to the conjecture of Birch and Swinnerton-Dyer as the Birch-Swinnerton-Dyer conjecture, whereas others write the Birch and Swinnerton-Dyer conjecture. Is there a style which you recommend?
A. Since using two hyphens (or an en dash and a hyphen) would be confusing, use and instead.