Teaching Problems: No. 1

[摘要] Welcome to Teaching Problems. This regular feature of MathemAttic is beingintroduced here with the expectation that it will appear in most issues.Teaching problems in my vocabulary refer to problems that are pedagogicallye ective. The value may be rooted in the elegance of a solution, a surprising\unsolvability" characteristic, hidden structural similarities to familiar problems,or counterintuitive results or .... The opening example in this issue brings attentionto a problem that o ers a variety of approaches to solution.

[学科分类] 数学（综合）