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Version differences in Integrate with Min[] in the integrand


Hi,

I don't think this is a function of differences in the internal use of 
Simplify. Anyone have an idea about what is going on here?

Gareth Russell
Columbia University


Integrate[Exp[-r*(Min[d2,t1]-Min[
        d1,t1])]/((d12-d11)*(d22-d21)),{d1,d11,d12},{d2,d21,d22}]

The result in v4.2

\!\(\(â?«\_d11\%d12\(â?«\_d21\%d22\( \[ExponentialE]\^\(\(-r\)\ \((\(-Min[d1, t1]\
\) + Min[d2, t1])\)\)\) \[DifferentialD]d2 \
\[DifferentialD]d1\)\)\/\(\((\(-d11\) + d12)\)\ \((\(-d21\) + d22)\)\)\)

The result in v5.0

\!\(\(\[ExponentialE]\^\(\(-d21\)\ r\)\ \((\(-\[ExponentialE]\^\(d11\ r\)\) - \
\[ExponentialE]\^\(d21\ r\) + \[ExponentialE]\^\(r\ \((d11 + d21 - t1)\)\) + \
\[ExponentialE]\^\(r\ t1\))\)\)\/\(\((d11 - d12)\)\ \((d21 - d22)\)\ r\^2\)\)

(Incorrect, I think...)

The result in v5.1.0

Nothing: runs for many minutes.


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