The "Introduction" to the first Critique captures the programme of the entire work through introducing two enormously influential distinctions which have nonetheless encountered considerable resistance ever since. Kant appeals to a twofold opposition between the apriori (independent of experience) and the a posteriori (dependent upon experience), on the one hand, and between analytic (explicative) judgements and synthetic (ampliative) judgements on the other, in order to defend autonomous philosophy as a synthetic a priori discipline.