The Nature of Arguments
Critical Reasoning for Beginners: week one
Marianne Talbot Department for Continuing Education University of Oxford Michaelmas 2009
Today we shall be looking at: (i) the nature of arguments (ii) how to recognise arguments
http://www.youtube.com/watch?v=teMlv3ripSM
Definition: ‘Argument’ …. a set of sentences such that… …. one of them is being said to be true… …. the other(s) are being offered as reasons for believing the truth of the one.
An argument:
It is Friday, Marianne always wears jeans on Friday so Marianne will be wearing jeans today.
Q1: List the sentences that make up this argument
It is Friday Marianne always wears jeans on Friday Marianne will be wearing jeans today
Conclusion: the sentence being said to be true Premises: the sentence(s) being offered as reason(s) for believing the one
An argument:
It is Friday, Marianne always wears jeans on Friday so Marianne will be wearing jeans today.
Q2: Identify the conclusion of the argument Q3: Identify the premises of the argument
An argument:
It is Friday, Marianne always wears jeans on Friday so Marianne will be wearing jeans today.
The conclusion is in red The premises are in green
It is important to distinguish arguments from sets of sentences
Sets of sentences that are not arguments might:
a) have no relation at all between them; b) have between them a relation other than that characterising an argument
A set of sentences that isn’t an argument:
The sea is salt Melbourne is in Australia
But note how easy it is to make it an argument…..
The sea is salt Therefore Melbourne is in Australia Arguing is something we do with sentences
Which of these sets of sentences are arguments?
1. Towards lunchtime clouds formed and the sky blackened. Then the storm broke. 2. Since Manchester is north of Oxford and Edinburgh is north of Manchester, Edinburgh is north of Oxford. 3. Witches float because witches are made of wood and wood floats. 4. Since
Marianne Talbot Department for Continuing Education University of Oxford Michaelmas 2009
Today we shall be looking at: (i) the nature of arguments (ii) how to recognise arguments
http://www.youtube.com/watch?v=teMlv3ripSM
Definition: ‘Argument’ …. a set of sentences such that… …. one of them is being said to be true… …. the other(s) are being offered as reasons for believing the truth of the one.
An argument:
It is Friday, Marianne always wears jeans on Friday so Marianne will be wearing jeans today.
Q1: List the sentences that make up this argument
It is Friday Marianne always wears jeans on Friday Marianne will be wearing jeans today
Conclusion: the sentence being said to be true Premises: the sentence(s) being offered as reason(s) for believing the one
An argument:
It is Friday, Marianne always wears jeans on Friday so Marianne will be wearing jeans today.
Q2: Identify the conclusion of the argument Q3: Identify the premises of the argument
An argument:
It is Friday, Marianne always wears jeans on Friday so Marianne will be wearing jeans today.
The conclusion is in red The premises are in green
It is important to distinguish arguments from sets of sentences
Sets of sentences that are not arguments might:
a) have no relation at all between them; b) have between them a relation other than that characterising an argument
A set of sentences that isn’t an argument:
The sea is salt Melbourne is in Australia
But note how easy it is to make it an argument…..
The sea is salt Therefore Melbourne is in Australia Arguing is something we do with sentences
Which of these sets of sentences are arguments?
1. Towards lunchtime clouds formed and the sky blackened. Then the storm broke. 2. Since Manchester is north of Oxford and Edinburgh is north of Manchester, Edinburgh is north of Oxford. 3. Witches float because witches are made of wood and wood floats. 4. Since