is the limit of the quantity possessed by the successive converging situations of
in the successive durations of an abstractive class (of durations in the time-system
which converges to
.
The volume-density, at a time
is the limit of the quantity possessed by the successive converging situations of
in the successive durations of an abstractive class (of durations in the time-system
which converges to
.
The volume-density, at a time