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Samuel Newbold authored
* Improved error handling while deleting 17% of builtin.cc and removing three quarters of the C++ throw statements. * (A +- B) != A iff B != 0 and (A */ B) != A iff A != 0 and B != 1 otherwise an .epsilon exception is thrown * Also, added .var_multiply and * function * A first version of a validating ln function