/sys$common/syshlp/helplib.hlb FORTRAN, Error Messages, Run Time Errors, General, UNDEXP  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  NUMBER:  82

  ERROR CODE:  F, C

  MESSAGE TEXT:  undefined exponentiation

  EXPLANATION:  An exponentiation that is mathematically undefined
  was attempted, for example, 0.**0.  The result returned was the
  reserved operand -0 (for floating-point operations) or zero (for
  integer operations).