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Logic & Fallacies

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INTRODUCTION

LAW FOUNDATION

LAW AND …

1. LOGIC

2. SCIENCE

3. THEORY

4. SOCIAL PROBLEMS

LAW FOUNDATION

Critical = informed and logical

Responsible = social equity

Creative = independent and considered

Interrelations -- with other disciplines and institutions

Historical, philosophical, economic, political and social context

== acquaintance with historical development of theory

Contemporary social issues:

· Terrorism
· Refugees
· Crime and punishment

Historical context

John Locke?

Karl Marx?

LOGIC

What is wrong with this statement?

In the war on terror, you are either with us or against us

Which of the following is sound?

All men have hair

I have hair

Therefore I am a man

All men have hair

I am a man

Therefore I have hair

Logic definitions

Logic = science that evaluates arguments

Argument = group of statements, with premises claimed to support conclusions [also inference]

Statement = sentence that is either true or false [also proposition]

Premise = statement setting forth reasons or evidence

Conclusion = statement that the evidence is claimed to support or imply

Arguments and non-arguments

Arguments must have a factual claim and an inferential claim.

The following are not arguments:
· warnings or advice
· belief or opinion
· loosely associated statements
· factual reports
· explanations
· illustrations
· conditional statements

Deduction and induction

Deductive argument: the conclusion is claimed to follow necessarily from the premises.

Inductive argument: the conclusion is probably true.

Unfortunately, in most arguments the distinction is not explicit.

We then need to evaluate the argument according to:

1. special indicator words
2. actual strength of inferential link
3. form of argumentation

Some forms of deduction

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