**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.