The ISC currently accepts either floating point expressions or
correct Maple syntax as input. However, for Maple syntax requiring too
long for evaluation, a timeout has been implemented.
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The Inverse Symbolic Calculator (ISC) uses a combination of lookup tables and integer relation algorithms in order to associate a closed form representation with a user-defined, truncated decimal expansion (written as a floating point expression). The lookup tables include a substantial data set compiled by S. Plouffe both before and during his period as an employee at CECM.
Here are a few numbers which the Standard Lookup cannot handle, but which the Advanced Lookup can find: