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<div style='text-align:right;position:absolute;top:92.0%;left:72.65%;
width:18.91%;height:3.0%'><span style='font-family:"Times New Roman";
mso-ascii-font-family:"Times New Roman";font-size:58%;mso-field-code:meta16'>43</span><span
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<div style='position:absolute;top:5.5%;left:5.8%;width:109.17%;height:5.75%'>令<span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'>
</span><span style='font-family:Symbol;mso-char-type:symbol'><i>t</i></span><span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'>=</span><span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'><i>{x1/s1,
x2/s2, …, xn/sn}</i></span><span lang=EN-US style='font-family:"Times New Roman";
mso-ascii-font-family:"Times New Roman";mso-fareast-language:ZH-CN'> </span>和<span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'>
</span><span style='font-family:Symbol;mso-char-type:symbol'><i>s</i></span><span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'><i>=</i></span><span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'><i>{y1/t1,
y2/t2, …, yn/tn}</i></span><span lang=EN-US style='font-family:"Times New Roman";
mso-ascii-font-family:"Times New Roman";mso-fareast-language:ZH-CN'><span
style="mso-spacerun: yes"> </span></span>是两个 </div>
<div style='position:absolute;top:11.25%;left:5.8%;width:108.8%;height:5.25%'>替换<span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'>.
</span>在<span style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'>
</span><span style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'><i>{x1/s1,
x2/s2, …, xn/sn,y1/t1, y2/t2, …, yn/tn} </i></span>中删除满足 </div>
<div style='position:absolute;top:16.5%;left:5.8%;width:91.01%;height:5.25%'>下面条件的元素<span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'>: </span></div>
<div style='position:absolute;top:21.5%;left:5.8%;width:91.01%;height:5.75%'><span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'><i>1.</i></span><span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'><span
style="mso-spacerun: yes"> </span></span><span lang=EN-US
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-language:ZH-CN'><i>yi/ti</i></span><span lang=EN-US
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-language:ZH-CN'>, </span>当<span style='font-family:"Times New Roman";
mso-ascii-font-family:"Times New Roman"'> </span><span style='font-family:
"Times New Roman";mso-ascii-font-family:"Times New Roman"'><span
style="mso-spacerun: yes"> </span></span><span lang=EN-US
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-language:ZH-CN'><i>ti</i></span><span lang=EN-US style='font-family:
Symbol;mso-fareast-language:ZH-CN;mso-char-type:symbol'><i>Î</i></span><span
lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-language:ZH-CN'><i>{x1,x2,…,xn}; </i></span></div>
<div style='position:absolute;top:27.25%;left:5.8%;width:91.01%;height:5.25%'><span
lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-language:ZH-CN'><i>2.</i></span><span lang=EN-US style='font-family:
"Times New Roman";mso-ascii-font-family:"Times New Roman";mso-fareast-language:
ZH-CN'><span style="mso-spacerun: yes"> </span></span><span lang=EN-US
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-language:ZH-CN'><i>xi/si</i></span><span lang=EN-US
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-language:ZH-CN'>, </span>当<span style='font-family:"Times New Roman";
mso-ascii-font-family:"Times New Roman"'> </span><span lang=EN-US
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-language:ZH-CN'><i>si=xi</i></span><span lang=EN-US
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-language:ZH-CN'>. </span></div>
<div style='position:absolute;top:32.25%;left:5.8%;width:91.01%;height:5.75%'>称这样得到的替换为<span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'>
</span><span style='font-family:Symbol;mso-char-type:symbol'><i>t</i></span><span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'>
</span>与<span style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'>
</span><span style='font-family:Symbol;mso-char-type:symbol'><i>s</i></span><span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'><i><span
style="mso-spacerun: yes"> </span></i></span>的<span style='font-family:
仿宋_GB2312;mso-fareast-font-family:仿宋_GB2312'>积</span><span style='font-family:
"Times New Roman";mso-ascii-font-family:"Times New Roman"'>(</span>合成<span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'>),
</span>记为<span style='font-family:"Times New Roman";mso-ascii-font-family:
"Times New Roman"'> </span><span style='font-family:Symbol;mso-char-type:symbol'><i>ts</i></span><span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'><i>
. </i></span></div>
<div style='position:absolute;top:38.25%;left:5.8%;width:91.01%;height:4.75%'><i> </i></div>
<div style='position:absolute;top:42.75%;left:5.8%;width:91.01%;height:5.75%'>例<span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'><i>:
</i></span><span style='font-family:Symbol;mso-char-type:symbol'><i>t</i></span><span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'>=</span><span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'><i>{x/f(y),
z/y}</i></span><span lang=EN-US style='font-family:"Times New Roman";
mso-ascii-font-family:"Times New Roman";mso-fareast-language:ZH-CN'>, </span><span
lang=EN-US style='font-family:Symbol;mso-fareast-language:ZH-CN;mso-char-type:
symbol'><i>s</i></span><span lang=EN-US style='font-family:"Times New Roman";
mso-ascii-font-family:"Times New Roman";mso-fareast-language:ZH-CN'><i>=</i></span><span
lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-language:ZH-CN'><i>{x/a, y/b, …, y/z} </i></span></div>
<div style='position:absolute;top:48.25%;left:5.8%;width:91.01%;height:5.75%'><span
lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-language:ZH-CN'><i><span style="mso-spacerun:
yes"> </span></i></span><span lang=EN-US
style='font-family:Symbol;mso-fareast-language:ZH-CN;mso-char-type:symbol'><i>ts</i></span><span
lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-language:ZH-CN'><i>={x/f(b),z/y} </i></span></div>
<div style='position:absolute;top:54.25%;left:5.8%;width:91.01%;height:4.75%'><span
lang=EN-US style='mso-fareast-language:ZH-CN;display:none'><i> </i></span></div>
<div style='position:absolute;top:58.75%;left:5.8%;width:107.11%;height:5.75%'>一个表达式集<span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'>
</span><span style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'><i>{E1,E2,…,Em}
</i></span>是<span style='font-family:仿宋_GB2312;mso-fareast-font-family:仿宋_GB2312'>可合一</span>的<span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'>,<span
style="mso-spacerun: yes"> </span>iff </span>存在一个替换<span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'>
</span><span style='font-family:Symbol;mso-char-type:symbol'><i>q</i></span><span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'><span
style="mso-spacerun: yes"> </span> </span></div>
<div style='position:absolute;top:64.0%;left:5.8%;width:91.01%;height:5.75%'>使得<span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'>
</span><span lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:
"Times New Roman";mso-fareast-language:ZH-CN'><i>E 1</i></span><span
lang=EN-US style='font-family:Symbol;mso-fareast-language:ZH-CN;mso-char-type:
symbol'><i>q</i></span><span lang=EN-US style='font-family:"Times New Roman";
mso-ascii-font-family:"Times New Roman";mso-fareast-language:ZH-CN'><i> </i></span><span
lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-language:ZH-CN'>=</span><span lang=EN-US style='font-family:"Times New Roman";
mso-ascii-font-family:"Times New Roman";mso-fareast-language:ZH-CN'><i>E2</i></span><span
lang=EN-US style='font-family:Symbol;mso-fareast-language:ZH-CN;mso-char-type:
symbol'><i>q</i></span><span lang=EN-US style='font-family:"Times New Roman";
mso-ascii-font-family:"Times New Roman";mso-fareast-language:ZH-CN'><i>=</i></span><span
lang=EN-US style='font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
mso-fareast-language:ZH-CN'><i>…</i></span><span lang=EN-US style='font-family:
"Times New Roman";mso-ascii-font-family:"Times New Roman";mso-fareast-language:
ZH-CN'><i>=Em</i></span><span lang=EN-US style='font-family:Symbol;mso-fareast-language:
ZH-CN;mso-char-type:symbol'><i>q</i></span><span lang=EN-US style='font-family:
"Times New Roman";mso-ascii-font-family:"Times New Roman";mso-fareast-language:
ZH-CN'><i>. </i></span><span lang=EN-US style='font-family:Symbol;mso-fareast-language:
ZH-CN;mso-char-type:symbol'><i>q</i></span><span lang=EN-US style='font-family:
"Times New Roman";mso-ascii-font-family:"Times New Roman";mso-fareast-language:
ZH-CN'><i> </i></span>称为合一子<span style='font-family:"Times New Roman";
mso-ascii-font-family:"Times New Roman"'>. </span></div>
<div style='position:absolute;top:70.25%;left:5.8%;width:91.01%;height:4.75%'> </div>
<div style='position:absolute;top:75.25%;left:5.8%;width:94.0%;height:5.25%'><span
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman"'><span
style="mso-spacerun: yes"> </span></span><span
lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-language:ZH-CN'><i>p(A,y,z){x/A,y/B,z/C}=p(A,B,C)=p(x,B,z){x/A,y/B,z/C} </i></span></div>
<div style='position:absolute;top:81.0%;left:5.8%;width:91.01%;height:4.75%'><span
lang=EN-US style='mso-fareast-language:ZH-CN;display:none'><i> </i></span></div>
<div style='position:absolute;top:85.75%;left:5.8%;width:91.01%;height:5.25%'><span
lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-language:ZH-CN'><span style="mso-spacerun: yes"> </span></span><span
lang=EN-US style='mso-fareast-language:ZH-CN'> </span></div>
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