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Without knowing the general characteristics of J. Habermas' discursive ethics, it will be difficult to understand the philosophical foundations of R. Alexy's theory of argumentation, with its constructivist moral objectivism. It is also interesting to appreciate the discrepancies between Habermas and Alexy on whether discursive rationality is useful or not for the discourse of application of law by judges. Juan Antonio García Amado explains it in this video.