Topical logic is the

logic Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the science of deductively valid inferences or of logical truths. It is a formal science investigating how conclusions follow from premis ...

of topical argument, a branch of

rhetoric Rhetoric () is the art of persuasion, which along with grammar and logic (or dialectic), is one of the three ancient arts of discourse. Rhetoric aims to study the techniques writers or speakers utilize to inform, persuade, or motivate par ...

developed in the

Late Antique Late antiquity is the time of transition from classical antiquity to the Middle Ages, generally spanning the 3rd–7th century in Europe and adjacent areas bordering the Mediterranean Basin. The popularization of this periodization in English has ...

period from earlier works, such as

Aristotle Aristotle (; grc-gre, Ἀριστοτέλης ''Aristotélēs'', ; 384–322 BC) was a Greek philosopher and polymath during the Classical Greece, Classical period in Ancient Greece. Taught by Plato, he was the founder of the Peripatet ...

's ''

Topics Topic, topics, TOPIC, topical, or topicality may refer to: Topic / Topics * Topić, a Slavic surname * ''Topics'' (Aristotle), a work by Aristotle * Topic (chocolate bar), a brand of confectionery bar * Topic (DJ), German musician * Topic (g ...

'' and

Cicero Marcus Tullius Cicero ( ; ; 3 January 106 BC – 7 December 43 BC) was a Roman statesman, lawyer, scholar, philosopher, and academic skeptic, who tried to uphold optimate principles during the political crises that led to the est ...

's ''Topica''. It consists of

heuristics A heuristic (; ), or heuristic technique, is any approach to problem solving or self-discovery that employs a practical method that is not guaranteed to be optimal, perfect, or rational, but is nevertheless sufficient for reaching an immediate, ...

for developing

argument An argument is a statement or group of statements called premises intended to determine the degree of truth or acceptability of another statement called conclusion. Arguments can be studied from three main perspectives: the logical, the dialect ...

s, 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. Cicero took the theory of Aristotle to be an aspect of rhetoric. As such it belongs to ''inventio'' in the classic fivefold division of rhetoric. The standard classical work on topical logic was the ''De Topicis Differentiis'' (On Topical Differentiae) by

Boethius Anicius Manlius Severinus Boethius, commonly known as Boethius (; Latin: ''Boetius''; 480 – 524 AD), was a Roman senator, consul, '' magister officiorum'', historian, and philosopher of the Early Middle Ages. He was a central figure in the t ...

. ''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 Themistius ( grc-gre, Θεμίστιος ; 317 – c. 388 AD), nicknamed Euphrades, (eloquent), was a statesman, rhetorician, and philosopher. He flourished in the reigns of Constantius II, Julian, Jovian, Valens, Gratian, and Theodosius I; a ...

. In terminology, the Greek ''axioma'' and ''topos'' in Boethius became the Latin ''maxima propositio'' (

maxim Maxim or Maksim may refer to: Entertainment *Maxim (magazine), ''Maxim'' (magazine), an international men's magazine ** Maxim (Australia), ''Maxim'' (Australia), the Australian edition ** Maxim (India), ''Maxim'' (India), the Indian edition *Maxim ...

, universal truth) and ''locus''. In the

Middle Ages In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire ...

topical logic became a theory of

inference Inferences are steps in reasoning, moving from premises to logical consequences; etymologically, the word '' infer'' means to "carry forward". Inference is theoretically traditionally divided into deduction and induction, a distinction that ...

, for which the name "axiomatic topics" has been suggested.

Abelard Peter Abelard (; french: link=no, Pierre Abélard; la, Petrus Abaelardus or ''Abailardus''; 21 April 1142) was a medieval French scholastic philosopher, leading logician, theologian, poet, composer and musician. This source has a detailed descr ...

wanted to complete a theory of

entailment Logical consequence (also entailment) is a fundamental concept in logic, which describes the relationship between statements that hold true when one statement logically ''follows from'' one or more statements. A valid logical argument is one ...

by invoking the ''loci'' in Boethius to fill in conditionals, a flawed if bold development.

Peter of Spain __NOTOC__ Peter of Hispania ( la, Petrus Hispanus; Portuguese and es, Pedro Hispano; century) was the author of the ', later known as the ', an important medieval university textbook on Aristotelian logic. As the Latin ''Hispania'' was conside ...

, in his ''De locis'', developed the ideas of Boethius. The ''De inventione dialectica'' of

Rodolphus Agricola Rodolphus Agricola ( la, Rudolphus Agricola Phrisius; August 28, 1443, or February 17, 1444 – October 27, 1485) was a pre- Erasmian humanist of the Northern Low Countries, famous for his knowledge of Latin and Greek. He was an educator, musi ...

(1479) made large claims for this method, as an aspect of

dialectic Dialectic ( grc-gre, διαλεκτική, ''dialektikḗ''; related to dialogue; german: Dialektik), also known as the dialectical method, is a discourse between two or more people holding different points of view about a subject but wishing to ...

(traditionally contrasted with rhetoric) subordinated to ''inventio''. 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 Philip Melanchthon. (born Philipp Schwartzerdt; 16 February 1497 – 19 April 1560) was a German Lutheran reformer, collaborator with Martin Luther, the first systematic theologian of the Protestant Reformation, intellectual leader of the L ...

and

Petrus Ramus Petrus Ramus (french: Pierre de La Ramée; Anglicized as Peter Ramus ; 1515 – 26 August 1572) was a French humanist, logician, and educational reformer. A Protestant convert, he was a victim of the St. Bartholomew's Day massacre. Early life ...

.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 Ramism was a collection of theories on rhetoric, logic, and pedagogy based on the teachings of Petrus Ramus, a French academic, philosopher, and Huguenot convert, who was murdered during the St. Bartholomew's Day massacre in August 1572. Accord ...

Notes

Further reading

See also