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Topical logic
Topical logic is the logic of topical argument, a branch of rhetoric developed in the Late Antique period from earlier works, such as Aristotle's ''Topics'' and Cicero's ''Topica''. It consists of heuristics for developing arguments, which are in the first place plausible rather than rigorous, from commonplaces (''topoi'' or ''loci''). In other words, therefore, it consists of standardized ways of thinking up debating techniques from existing, thought-through positions. The actual practice of topical argument was much developed by Roman lawyers.〔http://plato.stanford.edu/entries/boethius/〕〔http://plato.stanford.edu/entries/logic-ancient/〕 Cicero took the theory of Aristotle to be an aspect of rhetoric.〔A. A. Long, ''From Epicurus to Epictetus: Studies in Hellenistic and Roman Philosophy'' (2006), p. 302.〕 As such it belongs to ''inventio'' in the classic fivefold division of rhetoric.
The standard classical work on topical logic was the ''De Topicis Differentiae'' (On Topical Differentiae) by Boethius. ''Differentiae'' refer to case analysis, being the differentiations used to distinguish the cases into which a question is divided. Besides Aristotle and Cicero, Boethius built on Themistius.〔George Alexander Kennedy, ''Classical Rhetoric & Its Christian & Secular Tradition from Ancient to Modern Times'' (1999), p. 202.〕 In terminology, the Greek ''axioma'' and ''topos'' in Boethius became the Latin ''maxima propositio'' (maxim, universal truth) and ''locus''.
In the Middle Ages topical logic became a theory of inference, for which the name "axiomatic topics" has been suggested.〔Norman Kretzmann, Anthony Kenny, Jan Pinborg, ''The Cambridge History of Later Medieval Philosophy: From the Rediscovery of Aristotle to the Disintegration of Scholasticism, 1100-1600'' (1988), pp. 111-2.〕 Abelard wanted to complete a theory of entailment by invoking the ''loci'' in Boethius to fill in conditionals, a flawed if bold development.〔http://plato.stanford.edu/entries/abelard/〕〔Christopher J. Martin, ''Logic'', pp. 172-3 in Jeffrey E. Brower, Kevin Guilfoy (editors), ''The Cambridge Companion to Abelard'' (2004).〕 Peter of Spain, in his ''De locis'', developed the ideas of Boethius.〔http://plato.stanford.edu/entries/peter-spain/〕
The ''De inventione dialectica'' of Rodolphus Agricola (1479) made large claims for this method, as an aspect of dialectic (traditionally contrasted with rhetoric) subordinated to ''inventio''.〔Thomas M. Conley, ''Rhetoric in the European Tradition'' (1994), pp. 125-6.〕 The precise relationship of "dialectic" and "rhetoric" remained vexed well into the sixteenth century, hinging on the role assigned to ''loci''. It was expounded in different fashions by Philipp Melanchthon and Petrus Ramus.〔Harold J. Berman, ''Law and Revolution, II: The Impact of the Protestant Reformations on the Western Legal Tradition'' (2006), p. 112.〕 The debate fed into the later development of Ramism.
==Notes==
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