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Martinez, Felix; Rosa, De La – International Journal of Mathematical Education in Science & Technology, 2005
When first-year calculus students are interested in studying double integrals, they can find, in standard textbooks, a detailed description of the different regions of integration. The aims of this paper are: to give a criterion to select the plane that will be projected, to classify the projections, and to give a simple rule to obtain them.…
Descriptors: Textbooks, Calculus, Mathematical Formulas