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infinity: n. 1. The largest value that can be represented in a
   particular type of variable (register, memory location, data type,
   whatever).  2. `minus infinity': The smallest such value, not
   necessarily or even usually the simple negation of plus infinity.
   In N-bit twos-complement arithmetic, infinity is
   2^(N-1) - 1 but minus infinity is - (2^(N-1)),
   not -(2^(N-1) - 1).  Note also that this is different from
   "time T equals minus infinity", which is closer to a
   mathematician's usage of infinity.