Why I'm a stickler about presuppositions --- I would say that these two points, both of which are valid, are implications or inferences that you have made rather than presuppositions proper. The definition of a presupposition must contain the bit about 'holding true under negation.'

These distinctions may well sound artificial and far-fetched, but the reason I am singling out presuppositions for special attention is precisely because (1) they are empirically testable through the negation test - they are not merely the product of an over-imaginative interpretation of the text, and (2) they insert a claim which holds whether asserted or denied - that is a hugely powerful thing to do!

Source author: Biljana Scott biscott@diplomacy.edu