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6
$\bf命题1:$设$\left\{ {{a_n}} \right\}$为单调增加的数列,则$\lim \limits_{n \to \infty } {a_n} = \mathop {Sup}\limits_{k \ge 1} \left\{ {{a_k}} \right\}$证明:记\[M = ...
分类:其他好文   时间:2014-05-04 20:40:45    阅读次数:382
9
$\bf命题1:$任何实数都是某个有理数列的极限证明:设$A$为实数,若$A$为有理数,则令\[{a_n} = A,n \in {N_ + }\]即可,若$A$为无理数,则令\[{a_n} = \frac{{\left[ {nA} \right]}}{n},n \in {N_ + }\]其中${\l...
分类:其他好文   时间:2014-05-04 20:34:28    阅读次数:247
46
$\bf命题1:$任意方阵$A$均可分解为可逆阵$B$与幂等阵$C$之积证明:设$r\left( A \right) = r$,则存在可逆阵$P,Q$,使得\[PAQ = \left( {\begin{array}{*{20}{c}}{{E_r}}&0\\0&0\end{array}} \right...
分类:其他好文   时间:2014-05-04 20:20:38    阅读次数:337
49886
$\bf命题:$设实二次型\[f\left( {{x_1}, \cdots ,{x_n}} \right) = \sum\limits_{i = 1}^n {{{\left( {{a_{i1}}{x_1} + \cdots + {a_{in}}{x_n}} \right)}^2}} \]证明二次型的...
分类:其他好文   时间:2014-05-04 20:17:42    阅读次数:286
5656
$\bf命题1:$设$f(x)$是$\left[ {1, + \infty } \right)$上的非负单调减少函数,令\[{a_n} = \sum\limits_{k = 1}^n {f\left( k \right)} - \int_1^n {f\left( x \right)dx} ,n \i...
分类:其他好文   时间:2014-05-04 20:16:15    阅读次数:261
982
$\bf命题1:$设$A$,$B$均为实对称半正定阵,则$tr\left( {AB} \right) \le tr\left( A \right) \cdot tr\left( B \right)$证明:由$A$实对称知,存在正交阵$Q$,使得\[A = Qdiag\left( {{\lambda ...
分类:其他好文   时间:2014-05-04 20:12:18    阅读次数:365
9625
$\bf命题2:$设$A$,$B$均为实对称半正定阵,则$A$,$B$可同时合同对角化证明:由$A,B$半正定知$A+B$半正定,则存在可逆阵$P$,使得\[{P^T}\left( {A + B} \right)P = diag\left( {{E_r},0} \right)\]设\[{P^T}AP...
分类:其他好文   时间:2014-05-04 20:11:24    阅读次数:336
99
$\bf命题:$设$A \in {M_{m \times n}}\left( F \right),B \in {M_{n \times m}}\left( F \right),m \ge n,\lambda \ne 0$,则\[{\rm{ }}\left| {\lambda {E_m} - AB} ...
分类:其他好文   时间:2014-05-04 20:10:21    阅读次数:332
uva ``Accordian'' Patience
题目如下: ``Accordian'' Patience You are to simulate the playing of games of ``Accordian'' patience, the rules for which are as follows:     Deal cards one by one in a row from left to right, no...
分类:其他好文   时间:2014-05-04 09:08:31    阅读次数:329
travel the binary tree by level 3 ( from down to top and from right to left every level )
travel the binary tree by level 3 ( from down to top ) 个人信息:就读于燕大本科软件工程专业 目前大三; 本人博客:google搜索“cqs_2012”即可; 个人爱好:酷爱数据结构和算法,希望将来从事算法工作为人民作出自己的贡献; 博客内容:travel the binary tree by level 3 ( f...
分类:其他好文   时间:2014-05-04 09:00:55    阅读次数:294
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