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Kantian metaphysics in contemporary liberalism 2. The metaphysics of freedom as an idea of reason 3. The morality of external freedom 4. The Lex Permissiva: property rights and political obligation in the Rechtslehre 5. The general united will and cosmopolitan right 6. The metaphysics of Kant's cosmopolitanism.
Kerstein et al. (Mon,) studied this question.