This undergraduate thesis discusses the attempt of forming a system of deontic logic, made in the 1920s by the Austrian philosopher Ernst Mally. Presented in the text are the critiques of Mally᾽s theory and an attempt of implementing an alternative by P.T. Geach. This is followed by a connection to the norm-expressivism from the opus of Allan Gibbard. The text ends with a presentation of the connection between most discused authors in relation to the concept of ought.
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