三个例子足矣
虽然通常情况下无法仅凭几个例子证明一个定理，但有时却可以。以五边形数和截断三角形数为例：若五边形数定义为 Pn = (3n² − n)/2，三角形数定义为 Tn = (n² + n)/2，则存在关系 Pn = T2n−1 − Tn−1。文章通过可视化展示了这一数学关系。
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