作者hiei81 (宝贝。永远)
看板IMO_Taiwan
标题Re: [问题] Two problems
时间Wed Jan 19 03:41:18 2005
※ 引述《hiei81 (宝贝。永远)》之铭言:
: ※ 引述《pikahacker (Beat Cal)》之铭言:
: : 1. Prove that every tournament contains a Hamiltonian path.
: : (Tournament map: a directed graph such that for every pair of distinct
: : vertices
: : u and v, there is either an edge from u to v or v to u, but never both.)
: : (I can prove this easily by double induction, but I heard there is a
: : classic proof by strong induction. How?)
: 回darkseer,没有interestingly,请爱用it is interesting that...:)
呃...我错了,有interestingly这种用法:p
通常是讲:..., more interestingly, ....
然後double induction应该是指设f(k)和f(k+1)成立,则f(k+2)成立,
且初始条件f(1),f(2)成立
strong induction是指f(1)成立且f(1),f(2),...,f(k)均成立时,则f(k+1)成立
(数学归纳法第二形式)
而我们使用的证明方法既不是double induction也不是strong induction,
只是单纯的数学归纳法第一形式
关於数学归纳法可参阅:
http://www.soe.ucsc.edu/classes/cmpe177/Fall02/induction.pdf
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残缺的是任谁终其一生都无法得到一切,
完美的是任谁少了一点就不再是他本人了...
残缺的我寻寻觅觅找寻着残缺的你...
且让我们共同拼出一片无间的
完 美
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◆ From: 140.112.18.71
※ 编辑: hiei81 来自: 140.112.18.71 (01/19 03:41)
1F:推 LimSinE:这样的话,用"double"也可说是用"strong" 61.70.211.116 01/19