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发表于 2010-1-18 17:42:10
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来自 北京
In[23]:= m = 8;
t = 0.625145;
d[t] = (m (m + 1))^-2 \!\(
\*SubsuperscriptBox[\(\[Integral]\), \(0\), \(t\)]\(\((
SuperscriptBox[\(s\), \(-2\)] \((
\*UnderoverscriptBox[\(\[Sum]\), \(k = 1\), \(m\)]k \((
\*UnderoverscriptBox[\(\[Sum]\), \(l = 1\), \(m\)]l\ Exp[
\*FractionBox[\(-\((
\*SuperscriptBox[\(k\), \(2\)] +
\*SuperscriptBox[\(l\), \(2\)])\)\), \(4\
SuperscriptBox[\(m\), \(2\)]
\*SuperscriptBox[\(s\), \(2\)]\)]] BesselI[0, s] \((
\*FractionBox[\(-\((k\ l)\)\), \(4\
SuperscriptBox[\(m\), \(2\)]
\*SuperscriptBox[\(s\), \(2\)]\)])\))\))\))\) \[DifferentialD]s\)\) \
// N
Out[25]= -0.0738386 |
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