Causation, [34] ff., [79], [212] ff.
law of, [221].
not a priori, [223], [232].
Certainty, degrees of, [67], [68], [212].
Change,
demands analysis, [151].
Classes, [202].
non-existence of, [205] ff.
Classical tradition, [3] ff., [58].
Congruence, [195].