Editing mathematics is like editing a foreign language, with its own conventions, symbols, and rules of grammar. Various typographic rules must be followed exactly since deviations from them change the meaning of the material. Like poetry, placement of the information on the page is important for the meaning. The editor often must be a cryptographer, decoding esoteric handwritten material.
Burgan, Murrie W. STC Proceedings (1997). Articles>Scientific Communication>Technical Editing>Mathematics