'True premises' diaporamas de présentation

logic

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Logical Arguments

Logical Arguments. An argument is a chain of reasoning designed to prove something. An argument is a set of statements, some of which serve as premises, one of which serves as a conclusion, where the premises are intended to provide evidence for the conclusion. An argument consists of:.

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This is Introductory Logic PHI 120

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Logic ~ evaluating arguments

Logic ~ evaluating arguments. Chapter 2 - Evaluating Deductive Arguments What we are doing in this section? evaluating arguments Cf. analyzing arguments Evaluation - general considerations 1. Are two types of evaluation which applies to all arguments. Logic ~ evaluating arguments.

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Logic

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WAYS OF KNOWING

WAYS OF KNOWING. SOURCE OF KNOWLEDGE Or OBSTACLE TO IT?. REASON. This is a way of acquiring new knowledge about the world We go beyond the immediate evidence of the senses. So, how good is your reasoning?. A man rides into town on Friday, he stays three night and leaves on Friday. HOW?

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Lecture 10 Methods of Proof

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Rules of Replacement

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Valid and Invalid Arguments

Valid and Invalid Arguments. In mathematics and logic an argument is not a dispute. It is a sequence of statements ending in a conclusion .

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Ethics

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Review: Rationalism

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Review: Rationalism

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Stefano Gattei

Stefano Gattei. LOGIC and ARGUMENTATION THEORY. PhD programmes in CSE, EMI, MDCH and PSIC IMT Institute for Advanced Studies , Lucca 2011. stefano.gattei@imtlucca.it http://www.imtlucca.it/stefano.gattei. BRIEF DESCRIPTION. The aim is to provide a (short) guide to correct reasoning.

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Introduction to Philosophy Lecture 2 A deeper look at arguments

Introduction to Philosophy Lecture 2 A deeper look at arguments. By David Kelsey. Conclusions as premises. Conclusions as premises: The Margaret example (example 1), 1) Every student who made 90 percent or better on the midterms already has an A.

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Essential Deduction

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Chapter 1

Chapter 1. The Logic of Compound Statements. Section 1.3. Valid & Invalid Arguments. Review. Review of last lecture Conditional Statement if-then, -> p -> q ? ~ p v q Negation of Conditional ~( p -> q ) ? p ^ ~ q Contrapositive of Conditional p -> q ? ~ q -> ~ p. Review

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Validity and Truth

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The Finite Universe Method

The Finite Universe Method. Bottom Line Meanings Where H__ = is happy . . . (x) Hx = Everything is happy. (?x) Hx = Something is happy. In a Universe containing only Tom . . . Everything is happy = Tom is happy (x) Hx = Ht. Something is happy = Tom is happy (?x) Hx = Ht

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Types of Reasoning

Types of Reasoning. Deductive vs. Inductive Arguments. Start with Observation. A good scientist / investigator is observant. Gaining knowledge from observations is cumulative.

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To address the difference: Look for special indicator words.

*Sometimes language is used only for the rhetorical purposes and to add to the impact of the conclusion. Much like indicators in syllogistic arguments can be prepositional phrases, ensure that the language used would work within an argument. To address the difference:

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