What bothered me was why. 用yuri manin的话直接回答题主足够了： when i was very young i was extremely interested in the fact that gauss found seven or eight proofs of the quadratic reciprocity law. 王小桃带你读文献：互易定理 the reciprocity theorem 在上一篇文章中，我们介绍了如何通过能量守恒定律来理解特勒根定理（tellegen's theorem），而本文将介绍另一个重要的定.
LeBron James Reflects on First 'Settling Down' with Wife Savannah
消极互惠？ 我看不出哪里消极 你对我好所以我对你好，互惠了 你对我不好我对你也不好，绝交了 所以什么是消极互惠？是不想互惠的意思吗？那ok啊与世隔绝就好了，保证跟谁都没有互. 传递性、结构平衡和层级 transitivity, structural balance, and hierarchy reciprocity, transitivity, the triad census, and for identifying cliques. Reciprocity = a situation or relationship in which two people or groups agree to do something similar for each other, to allow each other to have the same rights, etc 从上面可以看出，.
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