Discrete Mathematics logic questions

[unknown physicist]

Homework Statement

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"?

Homework Equations

No equations, only logic for discrete mathematics class.

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"

 

[NascentOxygen]

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.

 

[unknown physicist]

Homework Statement

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"?

Homework Equations

No equations, only logic for discrete mathematics class.

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"

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?