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Classroom Capsules and Notes

Note. We now return to our every-other-week schedule for featured articles, shown at the bottom of this page.

Capsules By Courses. We are organizing the capsules into courses, when possible using the same topics as are used in Course Communities. So far we have organized capsules for the following courses:

You may select topics within each course.


Featured Items

Characterize positive integers which can be written as a sum of consecutive integers

The author proves a geometric identity visually.

The rule for differentiation of a quotient leads to an integration by parts formula.

Varieties of cutting a wire and forming two geometric shapes have unifying properties.

Find a fraction with a decimal expansion matching a specified sequence.

An elementary proof to convince skeptics that 1/4 is in the Cantor set