Negating 'only some of the students are here'

  • Thread starter Thread starter Mr Davis 97
  • Start date Start date
Join the discussion
Registration is free. Start your own thread to ask a follow-up.
3 replies · 1K views
Mr Davis 97
Messages
1,461
Reaction score
44

Homework Statement


Negate the following: Only some of the students of the class are here today.

Homework Equations

The Attempt at a Solution


Is the negation of this statement that either no students are in class or all students are in class?
How would I write the original statement in logical form?
Finally, would the original statement change at all if we removed the "only?"
 
Physics news on Phys.org
My interpretation is, that only some means not all but at least two, and some alone would mean possibly all, but this is tricky and by no means unambiguous. language usually isn't 100% clear. How would you write the original statement in logical form?
 
Mr Davis 97 said:
Is the negation of this statement that either no students are in class or all students are in class?
Yes, in my opinon.

How would I write the original statement in logical form?
You could try writing your answer and then negating it.

Finally, would the original statement change at all if we removed the "only?"

In this context, I interpret the "only" to mean "not all", so, yes, it would change the interpretation provided we don't interpret "some" to imply "not all" by itself.

However, as others have said, there are subjective aspects to interpreting the original statement..