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.

Inverse Symbolic Calculator



Here are a few numbers which the Standard Lookup cannot handle, but which the Advanced Lookup can find:

0.4633300532797865327

4.1702478998208239228

1.1766642807732935681