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Tutorial One Exercises: 1.1 - 1.2- 1.3 - 1.4
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Exercise 1.1

 

1.

Peter believes that David has exactly four children, that his (David's) sister is Mary and that her only brother has only three children. Is what Peter believes consistent?

2.

Peter believes that David has three daughters and four sons, and he (David) has six children in all. Is what Peter believes consistent?

3.

Peter believes that Mary is a woman and that she has three hundred children. Is what he believes consistent?

4.

Peter believes that 2+2=5. Is what he believes consistent?

5.

John says, "Mary is coming to dinner tonight." David says, "Mary is not coming to dinner tonight." Is what they say consistent?

6.

John says, "I have four children." Mary says, "You have only three children." Is what they say consistent?

7.

Is the following set of sentences consistent? {Marmaduke is a man, Marmaduke is a cat}

8.

Is the following set of sentences consistent?{Socrates is a philosopher, Socrates is a footballer}

 

 

 

 

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