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Discrete Mathematics logic questions

  1. Nov 26, 2016 #1
    1. The problem statement, all variables and given/known data
    1. Why is the statement: " Vicky is not clever" Not a mathematical proposition? Provide examples please
    2. Why is the statement: "a^2+b^2=c^2 an indeterminate proposition?"
    3. Why is the negation of " If a triangle has two equal angles it is isosceles" = "Not all triangles with two equal angles are isosceles" and not "if a triangle has two equal angles it is not an isosceles"?

    2. Relevant equations
    No equations, only logic for discrete mathematics class.

    3. The attempt at a solution
    For the first and second, I said that they are both propositions, however I stated, that the second one is true rather than indeterminate. For the last one, I stated: "if a triangle has two equal angles it is not an isosceles"
     
  2. jcsd
  3. Nov 26, 2016 #2

    NascentOxygen

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    Staff: Mentor

    Please edit your post to provide your reasons, so we can see that you made a proper attempt to answer these (rather than just guessing).

    Until you show your reasoning, no one here will be able to give you any assistance.
     
  4. Nov 26, 2016 #3
    I said that the first and second are both propositions because being clever means that she understands things very quickly, which could be true or false, therefore a proposition. I said that a^2+b^2=c^2 is a true proposition because it is obviously shown in pythagoras theorem, therefore it is a true proposition. For the third one I wrote: " If a triangle has two equal angles it is not an isosceles" because is is the verb and I have negated the statement so I think that this is the correct place. So what is wrong with my logic???
     
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