 analysis |  Ayer, Alfred Jules |  Bradley, Francis Herbert |  consequentialism |  Kant, Immanuel |  metaethics |  Moore, George Edward: moral philosophy |  moral non-naturalism |  naturalism: moral |  perception: epistemological problems of |  perception: the problem of |  propositions |  reasons for action: justification, motivation, explanation |  Reid, Thomas |  Russell, Bertrand |  sense data |  skepticism |  supervenience |  truth: identity theory of |  value: intrinsic vs. extrinsic |  Wittgenstein, Ludwig 