1. ## Partial orders

State whether the following relations is a partial order

isAncestorOf

isSisterOf

{(2,1),(1,3)(2,3)}

2. Originally Posted by cj's mom
State whether the following relations is a partial order

isAncestorOf

isSisterOf

{(2,1),(1,3)(2,3)}
Why don't you tell us what you think the answers are?

3. I thought it was

yes

no

yes

but I wanted to check it out.

4. Originally Posted by cj's mom
I thought it was

yes

no

yes

but I wanted to check it out.
Be sure you check each as to being reflexive, antisymmetric and transitive.

5. ## Partial order

I looked at the relations
is Ancestor of
A is an ancestor of A = reflexive
if A is an ancestor of B then B is not an ancestor of A
if A is an ancestor of B and B is an ancestor of C then A is an ancestor of C.

The one I am stuck on is the antisymmetric.

Looking back I think the first two are yes and the last one is no

6. Originally Posted by cj's mom
I looked at the relations
is Ancestor of
A is an ancestor of A = reflexive
Do you really think that you are an ancestor of yourself?
Maybe we have different definitions of ancestor.

7. ## partial

okay I give up

8. Originally Posted by cj's mom
okay I give up
No, don't give up.
This is either a badly worded question or you did not take time to type up the exact question.
Usually a well written question would have given the domain of the relation.
Moreover, it is not good form to use such term as ancestor without defining it.

9. ## partial

That is the way it is written with no other information.