Computes the difference of two values in log-space.
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com.log.difference computes the difference of two values in log-space, log( e^x - e^y ),
without significant chance of overflow or underflow.
com.log.sum computes the sum of two values in log-space, log( e^x + e^y ), without
significant change of overflow or underflow.
com.log.factorial computes log(x!) which is equivalent to a summation.
The requested computation in log-space.
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