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Relation/KantVsHume: relations are not externally to ideas.
HumeVsKant: each relation is external in their terms - e.g. equality is not a property of the figures themselves - e.g. neighboring and distant figures do not explain what neighborhood and distance is - relation anticipates a synthesis - space/time: in mind only composition, bearing relation through fiction - E.g. association: creates relation, but does not explain that distance is a relation.
Relations/Hume: cannot be derived from experience, they are effects of association principles - external to the things (atomism).
KantVsHume: not externally - Kant: therefore critical philosophy instead of empiricism.
KantVsHume: relations are so far dependent on the nature of things, as things presuppose a synthesis as phenomena that result from the same source as the synthesis of relations. - Therefore, the critical philosophy is not empiricism. - There is an a priori, that means, the imagination is productive.
Causality/Hume is the only relation, from which something can be concluded.
I Gilles Delueze David Hume, Frankfurt 1997 (Frankreich 1953,1988)
II Norbert Hoerster Hume: Existenz und Eigenschaften Gottes aus Speck(Hg) Grundprobleme der großen Philosophen der Neuzeit I Göttingen, 1997