help !

Decide which of the following sentences are propositions: (62 Marks)

a) Fishswim.can

b) Ibe there in three days time.will

c) Please, will you shut up?

d) Its 3:30pm.

e) Iyou married.declare

f) Its about time you started question 2.

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- Feb 27th 2009, 05:32 AMsabina_19discrete maths
help !

Decide which of the following sentences are propositions: (*6**2 Marks*)

a) Fishswim.*can*

b) Ibe there in three days time.*will*

c) Please, will you shut up?

d) Its 3:30pm.

e) Iyou married.*declare*

f) Its about time you started question 2.

- Feb 27th 2009, 08:22 AMGrandadPropositions
Hello sabina_19A proposition is a statement that has a truth value - it's either true or false. (But note that you don't necessarily have to know what that value is.)

So (a) is a proposition. It doesn't matter whether or not fish can swim; the fact is that this statement may be true or false.

(b) is a proposition. We don't know whether or not it is true, but the fact is that either you will be there in three days time, or you won't.

(c) is not a proposition. It's not making a true-or-false statement.

(d) is a proposition. It's either 3.30 pm or it isn't.

(e) is not a proposition. Don't confuse this with the statement 'You are married' which is either true or false.

(f) is either true or false. So it is a proposition.

Grandad