One Man’s Modus Ponens is Another Man’s Modus Tollens: Who Coined it and Where?

Who invented modus tollens?

The first to explicitly describe the argument form modus tollens was Theophrastus. Modus tollens is closely related to modus ponens. There are two similar, but invalid, forms of argument: affirming the consequent and denying the antecedent.

What is the meaning of modus ponens and modus tollens?

There are two consistent logical argument constructions: modus ponens (“the way that affirms by affirming“) and modus tollens (“the way that denies by denying”).

What is another name for modus tollens?

The first to explicitly state the argument form modus tollens were the Stoics. The inference rule modus tollens, also known as the law of contrapositive, validates the inference from implies and the contradictory of, to the contradictory of .

What is another name for modus ponens?

In propositional logic, modus ponens (/ˈmoʊdəs ˈpoʊnɛnz/; MP), also known as modus ponendo ponens (Latin for “method of putting by placing”) or implication elimination or affirming the antecedent, is a deductive argument form and rule of inference.

Who coined the word logic?


When Aristotle invented logic, what he invented was a logic of terms.

Who invented propositional logic?


Although propositional logic (which is interchangeable with propositional calculus) had been hinted by earlier philosophers, it was developed into a formal logic (Stoic logic) by Chrysippus in the 3rd century BC and expanded by his successor Stoics.

What is modus ponens and modus tollens rule in fuzzy logic?

Modus ponens refers to inferences of the form A ⊃ B; A, therefore B. Modus tollens refers to inferences of the form A ⊃ B; ∼B, therefore, ∼A (∼ signifies “not”). An example of modus tollens is the following: Related Topics: hypothetical syllogism.

What is modus ponens in philosophy?

p→q. p. ∴ q. This form of argument is calls Modus Ponens (latin for “mode that affirms“) Note that an argument can be valid, even if one of the premises is false.

What is modus tollens in philosophy?

Modus-tollens definition
Filters. (philosophy, logic) A valid form of argument in which the consequent of a conditional proposition is denied, thus implying the denial of the antecedent.

Who is the father of logic?


As the father of western logic, Aristotle was the first to develop a formal system for reasoning.

What is logic by Aristotle?

Aristotle’s logic was a term logic in the sense that it focused on logical relations between such terms in valid inferences. Aristotle was the first logician to use variables.

Who is father of philosophy?

Socrates of Athens (l. c. 470/469-399 BCE) is among the most famous figures in world history for his contributions to the development of ancient Greek philosophy which provided the foundation for all of Western Philosophy. He is, in fact, known as the “Father of Western Philosophy” for this reason.

Who is the father of Aristotle?

His father, Nicomachus, was the physician of Amyntas III (reigned c. 393–c. 370 bce), king of Macedonia and grandfather of Alexander the Great (reigned 336–323 bce). After his father’s death in 367, Aristotle migrated to Athens, where he joined the Academy of Plato (c.

Who is the mother of philosophy?

It is impossible to identify one person who is supposed to be the “father” or “mother” of philosophy, but Thales, Socrates, Plato, Aristotle, Confucius and Lao Zi might be considered influential figures within their respective traditions.

Who is the first philosopher?


The first philosopher is usually said to have been Thales.

What Thales known for?

Thales of Miletus, (born c. 624–620 bce—died c. 548–545 bce), philosopher renowned as one of the legendary Seven Wise Men, or Sophoi, of antiquity. He is remembered primarily for his cosmology based on water as the essence of all matter, with Earth a flat disk floating on a vast sea.