# Homework Guideline for 21-300 and 21-600 Fall 2011

In “Homework Guidelines”, Elizabeth Stapel wrote,

Mathematics is a language, and as such it has standards of writing which should be observed. In a writing class, one must respect the rules of grammar and punctuation, one must write in organized paragraphs built with complete sentences, and the final draft must be a neat paper with a title. Similarly, there are certain standards for mathematics assignments.

• End your proof in a fashionable way. Use QED or $\blacksquare$ (blacksquare) to indicate end of a proof.