*Primality testing via repeated differentiation of certain functions is the topic of this paper.*

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Displaying 1011 - 1020 of 1214

*A solution to a probabilistic Putnam Exam Problem is presented.*

*A short proof of the well-known fact that the unit interval \([0,1]\) is uncountable is presented by means of a simple infinite game. The author also used this game to show that a (non-empty)...*

*Three lemmas of interest in themselves from which Euler's Triangle Inequality follows are proved wordlessly.*

*A triangle labeled two different ways verifies the double angle formula for sines.*

*The authors discuss ways to induce students to recognize the use of symmetry to evaluate challenging integrals, and to prevent student sidesteps. *