Ideas from 'Ethics: Inventing Right and Wrong' by J.L. Mackie [1977], by Theme Structure

[found in 'Ethics: Inventing Right and Wrong' by Mackie,J.L. [Penguin 1979,0-14-021957-9]].

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22. Metaethics / C. Ethics Foundations / 1. Nature of Ethics / f. Ethical non-cognitivism
The 'error theory' of morals says there is no moral knowledge, because there are no moral facts