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Question:Is math21a suitable for math concentrators? Answer: Aspiring mathematicians should also consider math23, math25 or math55, where proofs are important. Math21a has had a many math and applied concentrators in the past. Math21a covers all the standard multivariable calculus you ever need and has more applications than any other multivariable calculus course at Harvard. Look at previous exhibits. While some of our homework is applied, we refrain from proofs or knowledge from other sciences in exams. You find some old exam problems here when Oliver was teaching the Fall 2011 course or for a summer course.