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Browse Classroom Capsules and Notes

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The result in the title is demonstrated graphically.

By exploiting the geometry of the cobweb plot, the author provides a simple and elementary derivation of the parameter for the period-three cycle of the logistic map.

The author gives a mapping of the ordered pairs of positive integers onto the positive integers which is immediately recognizable as a bijection.

The author uses Newton`s impact method to compute the centripetal force exerted on a particle moving uniformly on a circumference of a noneuclidean circle.

A combinatorial proof of a formula for the sum in the title is provided.
How do sequences of the form \((1+x/n)^{n + \alpha}\) with \(x > 0\) approach their limits?
The author presents three solutions to a problem concerning the terms of a certain linear recurrence modulo prime numbers.

The number \(2\) is a quadratic residue mod \(p\) if \(p = 8k + 1\) or \(p = 8k + 7\), but not if \(p = 8k + 3\) or \(p = 8k + 5\). This is proved by a simple counting argument, assuming the...

Given a positive integer \(m\), the authors exhibit a group with the probability \(1/m\) that two randomly selected elements commute.

The number of black squares in a crossword puzzle, and the number of marks needed to bound the black squares allows one to determine the number of words the puzzle contains.

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