Tutorial Contents Tutorial Seven: Designators - Designators, the tableau rules and individual constants - Using Russell's theory of descriptions - An oddity More Tutorials One Two Three Four Five Six

## 1

Which of the underlined expressions are p.r.o.'s?
(i)

The first person to swim the Atlantic was a good swimmer.

(ii)

John is not the first person to swim the Atlantic.

(iii)

John is not the first person to swim the English Channel

(iv)

John wrote a book about the first person to swim the Atlantic

(v)

"The first person to swim the Atlantic" became a best-seller.

(vi)

"The first person to swim the Atlantic" became a best-seller.

(vii)

Peter thinks that the first person to swim the Atlantic was able to swim.

(viii)

Peter thinks that the first person to swim the Atlantic was unable to swim.

(ix)

It could not have been the case that the first person to swim the Atlantic was unable to swim.

(x)

The first person to swim the Atlantic might not have been able to swim.

(xi)

John is afraid of the dog next door.

(xii)

John is afraid of the long legged scissorman.

(xiii)

The Prime Minister is always the First Lord of the Treasury.

(xiv)

The whale is a mammal.

(xv)

The square of an odd number is odd.

(xvi)

The highest prime number is odd.

(xvii)

Farther Christmas does not exist.

(xviii)

The removal of the safety net would be dangerous.

(xix)

The removal of the safety net was dangerous.

(xx)

Peter was so called because of his steadfast character.

(xxi)

Peter was named after his grandfather.

(xxii)

The Prime Minsister used to be John Major.

(xxiii)

The Prime Minister used to be a bachelor.