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<P>故事其实在证明楼主对魔方基本变换缺乏了解,搞不清用什么方法来证明三置换,如果没有认识到四轮换是魔方的基本变换,是生成三轮换的最基本变换,一切讨论都是枉然,不知道为什么,这里总会不定时出现一些拒绝承认魔方固有属性的“理智”言论。</P>
<P> </P>
<P>谁还能找出比下面更简单的证明?这么简单的问题都要费这么多口舌还说不清,真不知道是如何玩下去的。</P>
<P> </P>
<P> </P>
<P> </P>
<P><STRONG>三置换证明</STRONG></P>
<P>
<TABLE style="WIDTH: 324pt; BORDER-COLLAPSE: collapse" cellSpacing=0 cellPadding=0 width=432 border=0 xstr="">
<COLGROUP>
<COL style="WIDTH: 54pt" span=6 width=72></COL></COLGROUP>
<TBODY>
<TR style="HEIGHT: 14.25pt" height=19>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: 54pt; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" width=72 height=19><FONT face=宋体>A</FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; WIDTH: 54pt; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right width=72 xnum=""><FONT face=宋体>1</FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; WIDTH: 54pt; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right width=72 xnum=""><FONT face=宋体>2</FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; WIDTH: 54pt; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right width=72 xnum=""><FONT face=宋体>3</FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; WIDTH: 54pt; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right width=72 xnum=""><FONT face=宋体>4</FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; WIDTH: 54pt; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right width=72 xnum=""><FONT face=宋体>5</FONT></TD></TR>
<TR style="HEIGHT: 14.25pt" height=19>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" height=19><FONT face=宋体>B</FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right xnum=""><FONT face=宋体>4</FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right xnum=""><FONT face=宋体>1</FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right xnum=""><FONT face=宋体>2</FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right xnum=""><FONT face=宋体>3</FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right xnum=""><FONT face=宋体>5</FONT></TD></TR>
<TR style="HEIGHT: 14.25pt" height=19>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" height=19><FONT face=宋体>C</FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right xnum=""><FONT face=宋体>4</FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right xnum=""><FONT face=宋体>2</FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right xnum=""><FONT face=宋体>3</FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right xnum=""><FONT face=宋体>5</FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right xnum=""><FONT face=宋体>1</FONT></TD></TR>
<TR style="HEIGHT: 14.25pt" height=19>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" height=19><FONT face=宋体> </FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent"><FONT face=宋体> </FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent"><FONT face=宋体> </FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent"><FONT face=宋体> </FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent"><FONT face=宋体> </FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent"><FONT face=宋体> </FONT></TD></TR>
<TR style="HEIGHT: 14.25pt" height=19>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" height=19><FONT face=宋体> </FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right xnum=""><FONT face=宋体>4</FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent"><FONT face=宋体> </FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent"><FONT face=宋体> </FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right xnum=""><FONT face=宋体>5</FONT></TD>
<TD class=xl24 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-LEFT-COLOR: windowtext; BORDER-TOP-COLOR: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right xnum=""><FONT face=宋体>1</FONT></TD></TR></TBODY></TABLE></P>
<P> </P>
<P>1.四轮换是魔方结构决定的公理</P>
<P>2.A行代表块的初始位置</P>
<P>3.B行代表对A行的1,2,3,4块进行次向右的四轮换,生成环C(4,1,2,3)</P>
<P>4.C行代表对B行的块5,3,2,1块进行一次向左的四轮换,生成环C(4,5,1),即所谓的三置换</P>
<P>5.依据相似变换原理,只要有一种三置换成立,那么任意三个块可以进行三置换</P>
<P><STRONG></STRONG> </P>
<P><STRONG>说明</STRONG></P>
<P>四轮换是魔方结构定义的最基本的置换,正是依据相似变换原理,才使得列表讨论置换而不管魔方块的具体位置才成为可能,即所谓的置换变换与位置无关。</P>
[ 本帖最后由 pengw 于 2008-8-19 12:19 编辑 ] |
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