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Topic: Modus tollens

Related Topics

Modus ponens

Denying the antecedent

Affirming the consequent

Disjunctive syllogism

Logical necessity

Logical operator

Formal logic

Falsificationism

What the Tortoise Said to Achilles

Induction (philosophy)

Deductive logic

Falsifiability

List of topics in logic

Paul Feyerabend

Philosophy of science

	Modus tollens - Wikipedia, the free encyclopedia
		Modus tollens (Latin for "mode that denies") is the formal name for indirect proof or proof by contrapositive (contrapositive inference), often abbreviated to MT.
		Modus tollens became somewhat legendary when it was used by Karl Popper in his proposed response to the problem of induction, Falsificationism.
		Modus ponens - "one man's modus ponens is another man's modus tollens" (Dretske 1995)
	en.wikipedia.org /wiki/Modus_tollens (397 words)

	Modus ponens - Wikipedia, the free encyclopedia
		In Logic, Modus ponens (Latin: mode that affirms) is a valid, simple argument form (often abbreviated to MP).
		A propositional argument using modus ponens is said to be deductive.
		Modus ponens can also be referred to as affirming the antecedent or "Law of Detachment".
	en.wikipedia.org /wiki/Modus_ponens (343 words)

	Modus Tollens
		Modus Tollens is not as straightforward as its companion, Modus Ponens.
		Although common in argument, a Modus Tollens is not necessarily true, as the major premise (If X is true then Y is true) says nothing about falsehood.
		Modus Tollens is the root of falsification, as proposed by Karl Popper and since used as the cornerstone of scientific proof.
	changingminds.org /disciplines/argument/syllogisms/modus_tollens.htm (148 words)

	Modus tollens (Site not responding. Last check: 2007-10-21)
		Modus tollens (Latin : mode that denies) is the formal name for indirect proof.
		An argument can be valid even though it has a false premise; one has to distinguish between validity and soundness.
		See also: modus ponens, affirming the consequent, denying the antecedent, falsificationism.
	www.serebella.com /encyclopedia/article-Modus_tollens.html (296 words)

	Math Forum Discussions (Site not responding. Last check: 2007-10-21)
		Modus tollens and modus ponens and the contrapositive
		Re: Modus tollens and modus ponens and the contrapositive
		The Math Forum is a research and educational enterprise of the Drexel School of Education.
	mathforum.org /kb/thread.jspa?threadID=432911&messageID=1371002 (271 words)

	User:JMRyan/Test1 - Wikibooks, collection of open-content textbooks
		Modus Tollens is also sometimes known as 'Denying the Consequent'.
		The premise lines of Modus Tollens are a conditional and the negation of its consequent.
		The premise lines of this inference are a conditional and the opposite of its consequent, but not the negation of its consequent.
	en.wikibooks.org /wiki/User:JMRyan/Test1 (144 words)

	spro5phil102take-hometest4 (Site not responding. Last check: 2007-10-21)
		So, he is immature(B)." Explain in one sentence why this is modus ponens or modus tollens pattern of argument.
		So, she is not in love." Explain in one sentence why this is modus ponens or modus tollens pattern of argument.
		Therefore, he can't balance the budget." Explain in one sentence why this is correct or incorrect pattern of modus tollens.
	www.ccsn.nevada.edu /prs/traghunath/spro5phil102take-hometest4.html (229 words)

	The OpenScience Project » Elliot Sober on the Design Argument
		It isn’t just defenders of the design hypothesis who have fallen into the trap of supposing that there is a probabilistic version of modus tollens.
		Under modus tollens, if a theory X says that Y is probable, and we learn that in fact Y is not the case, then we should conclude that theory X is probably false.
		It is relatively easy to find an example which shows that the probabilistic version of modus tollens is incorrect.
	www.openscience.org /blog/wp-trackback.php?p=65 (726 words)

	Deductive Patterns
		Modus Ponens, Modus Tollens, or Denying theAntecedent ?
		Modus Ponens, Modus Tollens, Denying the Antecedent or Affirming the Consequent?
		We know that Claire is a cat because she is carnivorous, and if she is a cat, she is carnivorous.
	www.unlv.edu /faculty/coombs/patt.htm (463 words)

	Footnotes
		The Wason card problem is often diagnosed by psychologists by appeal to rules of inference like modus ponens and modus tollens.
		The foundational rule known as modus ponens says that given a conditional 9#9 and the antecedent p, one can infer to q.
		Another rule, also at the foundations of logic and mathematics (and formal disciplines generally), is modus tollens: 10#10, i.e., from a conditional and the falsity of its consequent one can infer to the falsity of its antecedent.
	www.rpi.edu /~faheyj2/SB/PROPS/SHERLOCK/sherlock/footnode.html (800 words)

	A Logic Primer
		If you go through it with a fine tooth comb, you will find that it is a version of modus ponens, with X now being "The bells are ringing" and Y being "There is a funeral going on." You will notice that X and Y are now the opposite way round from the previous version.
		The fact is, that statement is a perfectly logical version of modus ponens.
		In this exercise, each of the deductions is either modus ponens or modus tollens, and it may be valid or invalid.
	richardbowles.tripod.com /gmat/cr/logic.htm (2801 words)

	Modus Tollens \| fallacious (Site not responding. Last check: 2007-10-21)
		I'm not sure if modus tollens works in any system of formal logic or if L must meet certain preconditions.
		What I'm getting at is this: Assuming L lends itself to the application of modus tollens.
		If Q can only be well-formed if either Q or NOT Q can be derived in L, then modus tollens would be inapplicable by definition.
	fallacio.us /?q=node/1624&PHPSESSID=d6f8209b2353138a5d9c999dec577066 (1408 words)

	Argument Forms
		In fact, arguments of this form are so common that the form itself has a name, Modus Ponens, which we will usually abbreviate as M.P. On the other hand, consider what happens when we construct a truth-table for testing the validity of a distinct, though superficially similar, argument form:
		In arguments of this form, both premises are true on the first and on the third lines of the truth-table.
		Although it might be mistaken for M.P. at a casual glance, the fallacy—unlike its valid cousin—does not guarantee the truth of its conclusion.
	www.philosophypages.com /lg/e10b.htm (1065 words)

	Memory Distortion
		modus ponens: can infer the consequent if the antecedent is true
		modus tollens: can infer that an antecedent is false if the consequent is false
		modus tollens: backward reasoning from effects to causes
	www.cog.brown.edu /courses/42/lec11.htm (445 words)

	PHI 300 Overhead 05.02.16 Wednesday (Site not responding. Last check: 2007-10-21)
		One man’s modus ponens is another man’s modus tollens.
		Wesley: implicit modus tollens for belief in witches
		Russell: implicit modus ponens against belief in the Bible
	www.public.asu.edu /~kobes/300ov05.02.16wed.html (487 words)

	Solution for Reading Assingnment 3
		a) This is correct, using universal instantiation and modus tollens.
		d) This is correct, using universal instantiation and modus ponens.
		The University of Southern California does not screen or control the content on this website and thus does not guarantee the accuracy, integrity, or quality of such content.
	www-scf.usc.edu /~csci271/rq_jan24_answers.html (261 words)

	Modus tollens - All About All (Site not responding. Last check: 2007-10-21)
		It can also be referred to as denying the consequent.
		Also helps finding: Modustollens, kodus, ollens, moldus, tllens, midus, tolens, motus, tolens, odus, tollns, modis, tolles, mofus, tollen
		The M.O. of M.I. (The Modus Operandi of Male Intimacy)
	www.answers-zone.com /article/Modus_tollens (389 words)

	www.myspace.com/paganfire (Site not responding. Last check: 2007-10-21)
		I am the reigning Queen of Self-Absorption, and I am not troubled by that in the least because all that I love is a part of the me over whom I obsess.
		Modus Tollens's Latest Blog Entry [Subscribe to this Blog]
		Who I am...all about me...schizophrenic nightmares wrapped in self-deception with a hint of love for the south side Irish boys and a longing for the voices of the familiarity and comfortable scorn of Chicago girls, of course season that well with three close friends, paranoia, nicotine, daydreams and you have me pegged.
	www.myspace.com /47720441 (760 words)

	Law of Modus Tollens
		The following are VALID using the Law of Modus Tollens:
		Counter Examples using the Law of Modus Tollens
		The following are INVALID using the Law of Modus Tollens:
	www.sis.pitt.edu /~logicp/group1/modus_toll.html (208 words)

	Formal Logic/Sentential Logic/Disjunctions in Derivations - Wikibooks, collection of open-content textbooks
		This will provide a useful alternative to Disjunction Elimination (DE).
		Modus Tollendo Tollens is sometimes known as Disjunctive Syllogism and occasionally as the Rule of the Dog.
		This new rule requires the following two supporting theorems.
	en.wikibooks.org /wiki/Formal_Logic/Sentential_Logic/Disjunctions_in_Derivations (286 words)

	section9 (Site not responding. Last check: 2007-10-21)
		Pragmatic reasoning schemata: reasoning is based on generalized scenarios (schemata).
		plane study: impact of permission-schemata on modus tollens, Cheng and Holyoak, 1985)
		Mental models: reasoning based on different mental scenarios that picture the given premises and compare them to conclusion, the more mental models can be build based on given premises the more difficult it is to judge the validity of the conclusion.
	courses.washington.edu /basborch/section9.html (233 words)

	purevolume™ \| Modus Tollens
		All songs, lyrics and pictures © 2005 Modus Tollens.
		You must be logged in as a “LISTENER” to add comments.
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	www.purevolume.com /modustollens (32 words)

	Conditionals: Modus Ponens and Modus Tollens
		But the use of that rule involves more advanced techniques than we are concerned with at this point.
		Instead we will introduce a rule that we shall call 'modus tollens' (our mt rule).
		It enables us to move from lines p -› q and ~q to the line ~p.
	www.thelogiccourse.com /bluestorm/conditionalset.html (365 words)

	MAT 660: Discrete Structures for Mathematics Teachers
		1.3: Focus on learning the concept of validity, on knowing the meaning of modus ponens, modus tollens, converse error, and inverse error, and on recognizing forms of valid arguments (but except for modus ponens and modus tollens you don't need to learn their names).
		Also learn how to test for validity using a truth table.
		2.3: Focus on understanding the meaning of universal instantiation and recognizing universal modus ponens, universal modus tollens, and converse and inverse errors for quantified arguments.
	condor.depaul.edu /~sepp/mat660/Asmt1A04.htm (824 words)

	PSCH 352, Summer 2004, Prof. Kershaw: 7/8 Notes (Site not responding. Last check: 2007-10-21)
		Modus ponens and modus tollens are valid inferences.
		However, the Wason card task also shows that conditional reasoning is difficult, and might
		ponens task is much easier than the modus tollens task.
	www.uic.edu /classes/psych/psych352tk/7-8notes.html (220 words)

	"Can Virtue Be Taught?" (Part II) (Site not responding. Last check: 2007-10-21)
		If virtue can be taught, then there are teachers of virtue.
		Argument for premise #3: There are no teachers of virtue.
		This shows how virtue can guide behavior correctly and not be knowledge.
	www-unix.oit.umass.edu /~philo100/Meno(tr3-CanVirtueBeTaught-Pt2.html (151 words)

	TAPPED: Comment on (Site not responding. Last check: 2007-10-21)
		"One man's modus ponens is another man's modus tollens," and it's hard to know what else one can say about that.
		If one doesn't speak Latin, it's hard even to know what that means.
		Comments: (you may use HTML tags for style)
	www.prospect.org /cgi-bin/mtype/mt-comments.cgi?entry_id=2713 (231 words)

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