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"Logical consequence" - UNIT 1: CLASSICAL PROPOSITIONAL LOGIC

Published: 2017/01/27

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GATE - Maths - Propositional Logic - Tautological Implications And Logical Consequences

Published: 2015/05/13

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OCR MEI Core 1 10.03 Proof: Examples of Logical Consequence & Logical Equivalence

Published: 2016/04/14

Channel: Jack Brown

Modal logic 1.5 - logical consequence in K

Published: 2013/02/07

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Using Logical Consequences - Conscious Discipline Skills

Published: 2011/11/22

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Build the Relationship, Change the Behavior: Natural and Logical Consequences

Published: 2016/07/01

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Logical Consequences Strategy

Published: 2014/07/09

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Natural and Logical Consequences

Published: 2013/03/27

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Illogical vs Logical flow of consequences

Published: 2014/08/23

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Rudolf Dreikurs: Logical Consequences

Published: 2013/01/24

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entailment, validity, and refutation

Published: 2013/02/13

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Logical Consequences (Original Mix)

Published: 2015/02/02

Channel: Various Artists - Topic

The Concept of Logical Consequence

Published: 2017/02/14

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Practicing gentle parenting - Clip of a logical consequence

Published: 2013/08/17

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Natural and Logical Parenting Consequence Example

Published: 2010/06/16

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Logical Consequences

Published: 2017/09/08

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SEM121 - Entailment

Published: 2013/05/16

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OCR MEI Core 1 10.01 Proof: Logical Consequence

Published: 2016/04/14

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Logical Consequences

Published: 2016/04/05

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Tone of Voice When Using Logical Consequences for Children's Inappropriate Behavior

Published: 2011/10/30

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Using Natural And Logical Consequences With Kids

Published: 2017/04/20

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4.1 Truth Tables for Entailment, Equivalence, Etc.

Published: 2012/11/10

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The Concept of Logical Consequence

Published: 2017/02/08

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Dr. Charles Fay explains generic consequences

Published: 2009/08/06

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Logical Consequences

Published: 2016/01/10

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Logical Consequences

Published: 2015/12/15

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13 Defining Logical Consequence, T ⊨ ɸ

Published: 2016/11/22

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Published: 2015/09/12

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Published: 2016/03/24

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Published: 2011/02/02

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GATE - Maths - Propositional Logic - Logical Consequences - Simplification And Addition

Published: 2015/05/14

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Logical Consequences vs Punishment ECE 3662

Published: 2013/10/20

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The logical consequence & next step: Team Katusha-Alpecin

Published: 2016/10/12

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2 - 6 - 2.6 Logical Entailment-Introduction to Logic-Professor Mike Genesereth

Published: 2012/05/02

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GATE - Maths - Propositional Logic - Logical Consequences - Hypothetical Syllogism

Published: 2015/05/14

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What is Natural and Logical Consequences??

Published: 2012/07/18

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Archambault – The distinction between formal and material consequence in medieval logic

Published: 2017/02/20

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logical consequences.wmv

Published: 2010/03/16

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Secrets to Positive Parenting #10 - Logical Consequences

Published: 2014/03/13

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Mastaba Audio - Logical Consequence

Published: 2012/04/26

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Published: 2014/07/15

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PARENTING with logical consequences

Published: 2015/04/01

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Logical Consequences

Published: 2010/09/14

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the i.l.c. ill-logical consequence.[Short-movie.2006]

Published: 2006/09/07

Channel: Alessandro Gavazza

GATE - Maths - Propositional Logic - Logical Consequences - Modus Ponens And Modus Tollens

Published: 2015/05/14

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Natural and Logical consequences

Published: 2017/10/12

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Published: 2015/02/05

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Published: 2015/02/04

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The Concept of Logical Consequence

Published: 2016/05/20

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Published: 2016/05/11

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(Redirected from Semantic consequence)

**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 in which the conclusion is entailed by the premises, because the conclusion is the consequence of the premises. The philosophical analysis of logical consequence involves the questions: In what sense does a conclusion follow from its premises? and What does it mean for a conclusion to be a consequence of premises?^{[1]} All of philosophical logic is meant to provide accounts of the nature of logical consequence and the nature of logical truth.^{[2]}

Logical consequence is necessary and formal, by way of examples that explain with formal proof and models of interpretation.^{[1]} A sentence is said to be a logical consequence of a set of sentences, for a given language, if and only if, using only logic (i.e. without regard to any *personal* interpretations of the sentences) the sentence must be true if every sentence in the set is true.^{[3]}

Logicians make precise accounts of logical consequence regarding a given language , either by constructing a deductive system for or by formal intended semantics for language . The Polish logician Alfred Tarski identified three features of an adequate characterization of entailment: (1) The logical consequence relation relies on the logical form of the sentences, (2) The relation is a priori, i.e. it can be determined with or without regard to empirical evidence (sense experience), and (3) The logical consequence relation has a modal component.^{[3]}

The most widely prevailing view on how to best account for logical consequence is to appeal to formality. This is to say that whether statements follow from one another logically depends on the structure or logical form of the statements without regard to the contents of that form.

Syntactic accounts of logical consequence rely on schemes using inference rules. For instance, we can express the logical form of a valid argument as:

All are . All are . Therefore, all are .

This argument is formally valid, because every instance of arguments constructed using this scheme are valid.

This is in contrast to an argument like "Fred is Mike's brother's son. Therefore Fred is Mike's nephew." Since this argument depends on the meanings of the words "brother", "son", and "nephew", the statement "Fred is Mike's nephew" is a so-called material consequence of "Fred is Mike's brother's son," not a formal consequence. A formal consequence must be true *in all cases*, however this is an incomplete definition of formal consequence, since even the argument " is 's brother's son, therefore is 's nephew" is valid in all cases, but is not a *formal* argument.^{[1]}

If you know that follows logically from no information about the possible interpretations of or will affect that knowledge. Our knowledge that is a logical consequence of cannot be influenced by empirical knowledge.^{[1]} Deductively valid arguments can be known to be so without recourse to experience, so they must be knowable a priori.^{[1]} However, formality alone does not guarantee that logical consequence is not influenced by empirical knowledge. So the a priori property of logical consequence is considered to be independent of formality.^{[1]}

The two prevailing techniques for providing accounts of logical consequence involve expressing the concept in terms of *proofs* and via *models*. The study of the syntactic consequence (of a logic) is called (its) proof theory whereas the study of (its) semantic consequence is called (its) model theory.^{[4]}

A formula is a **syntactic consequence**^{[5]}^{[6]}^{[7]}^{[8]} within some formal system of a set of formulas if there is a formal proof in of from the set .

Syntactic consequence does not depend on any interpretation of the formal system.^{[9]}

A formula is a **semantic consequence** within some formal system of a set of statements

if and only if there is no model in which all members of are true and is false.^{[10]} Or, in other words, the set of the interpretations that make all members of true is a subset of the set of the interpretations that make true.

Modal accounts of logical consequence are variations on the following basic idea:

- is true if and only if it is
*necessary*that if all of the elements of are true, then is true.

Alternatively (and, most would say, equivalently):

- is true if and only if it is
*impossible*for all of the elements of to be true and false.

Such accounts are called "modal" because they appeal to the modal notions of logical necessity and logical possibility. 'It is necessary that' is often expressed as a universal quantifier over possible worlds, so that the accounts above translate as:

- is true if and only if there is no possible world at which all of the elements of are true and is false (untrue).

Consider the modal account in terms of the argument given as an example above:

- All frogs are green.
- Kermit is a frog.
- Therefore, Kermit is green.

The conclusion is a logical consequence of the premises because we can't imagine a possible world where (a) all frogs are green; (b) Kermit is a frog; and (c) Kermit is not green.

Modal-formal accounts of logical consequence combine the modal and formal accounts above, yielding variations on the following basic idea:

- if and only if it is impossible for an argument with the same logical form as / to have true premises and a false conclusion.

The accounts considered above are all "truth-preservational," in that they all assume that the characteristic feature of a good inference is that it never allows one to move from true premises to an untrue conclusion. As an alternative, some have proposed "warrant-preservational" accounts, according to which the characteristic feature of a good inference is that it never allows one to move from justifiably assertible premises to a conclusion that is not justifiably assertible. This is (roughly) the account favored by intuitionists such as Michael Dummett.

The accounts discussed above all yield monotonic consequence relations, i.e. ones such that if is a consequence of , then is a consequence of any superset of . It is also possible to specify non-monotonic consequence relations to capture the idea that, e.g., 'Tweety can fly' is a logical consequence of

- {Birds can typically fly, Tweety is a bird}

but not of

- {Birds can typically fly, Tweety is a bird, Tweety is a penguin}.

For more on this, see Non-monotonic inference relation.

- ^
^{a}^{b}^{c}^{d}^{e}^{f}Beall, JC and Restall, Greg,*Logical Consequence*The Stanford Encyclopedia of Philosophy (Fall 2009 Edition), Edward N. Zalta (ed.). **^**Quine, Willard Van Orman,*Philosophy of Logic*.- ^
^{a}^{b}McKeon, Matthew,*Logical Consequence*Internet Encyclopedia of Philosophy. **^**Kosta Dosen (1996). "Logical consequence: a turn in style". In Maria Luisa Dalla Chiara; Kees Doets; Daniele Mundici; Johan van Benthem.*Logic and Scientific Methods: Volume One of the Tenth International Congress of Logic, Methodology and Philosophy of Science, Florence, August 1995*. Springer. p. 292. ISBN 978-0-7923-4383-7.**^**Dummett, Michael (1993)*Frege: philosophy of language*Harvard University Press, p.82ff**^**Lear, Jonathan (1986)*Aristotle and Logical Theory*Cambridge University Press, 136p.**^**Creath, Richard, and Friedman, Michael (2007)*The Cambridge companion to Carnap*Cambridge University Press, 371p.**^**FOLDOC: "syntactic consequence" Archived 2013-04-03 at the Wayback Machine.**^**Hunter, Geoffrey, Metalogic: An Introduction to the Metatheory of Standard First-Order Logic, University of California Pres, 1971, p. 75.**^**Etchemendy, John,*Logical consequence*, The Cambridge Dictionary of Philosophy

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*Boolean Reasoning: The Logic of Boolean Equations*1st edition, Kluwer Academic Publishers, Norwell, MA. 2nd edition, Dover Publications, Mineola, NY, 2003. - Davis, Martin, (editor) (1965),
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*On the concept of logical consequence*Reprinted in Tarski, A., 1983.*Logic, Semantics, Metamathematics*, 2nd ed. Oxford University Press. Originally published in Polish and German. - A paper on 'implication' from math.niu.edu, Implication
- A definition of 'implicant' AllWords
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*Theory of Logical Calculi: Basic Theory of Consequence Operations*. Springer. ISBN 978-90-277-2785-5.

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*Stanford Encyclopedia of Philosophy*. - Logical consequence at the Indiana Philosophy Ontology Project
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*Internet Encyclopedia of Philosophy*. - Logical consequence at PhilPapers
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*Encyclopedia of Mathematics*, Springer Science+Business Media B.V. / Kluwer Academic Publishers, ISBN 978-1-55608-010-4

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