①什么是斯坦納點？ 　　假設原來已經給定了個點，庫朗等指出需要引進的點數至多為，此種點稱為斯坦納點。過每一斯坦納點，至多有三條邊通過。若為三條邊，則它們兩兩交成120°角；若為兩條邊，則此斯坦納點必 ...

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