I. Perez de Guzman and C. Rossi, "LNint: A temporal
logic that combines points and intervals and the absolute and relative
approaches", <I> Journal of the IGPL (Interest Group on
Propositional and Predicate Logic)</I>, 1995, Vol. 3, No. 5, pp. 745--764.
<P>

In knowledge representation, 
currently, there exist two main approaches to representing temporal
relations between events: the approach that uses moments of time, and
the approach that uses time intervals. In real life, we encounter both
instantaneous events (that correspond to moments of time) and
non-instantaneous ones (that correspond to intervals). Therefore, the
ideal knowledge representation language should describe both moments
and intervals. It is, of course, possible to describe moments of time
in interval-based formalisms as degenerate intervals and,
correspondingly, intervals as pairs of moments. However, this
artificial representation leads to unnecessary computations: e.g.,
when we represent each moment of time $t$ as a degenerate interval
$[t,t]$, then every operation with moments of time requires two
(identical) operations with interval bounds. 
<P>
In this paper, a new formalism is described that combines points and
intervals and that has a good computational behavior.