Here's the question you clicked on:
jollysailorbold
Could somebody explain what this sign means? (I'll draw it below.)
|dw:1359007073471:dw| (It has to do with inequalities, sets, and subsets)
for example: \[A \subseteq B\]
The set A is a subset of the set B or the same as the set B.
discrete math indeed
hmm, and if it's just like this? \[A \subset B\] ?
Then the set A is a subset of the set B.
Ah, I see. And \[A \cup B \] ?
$$a \le b$$ compared to $$a< b$$
def: the union of the sets a and b, denote by A U B is the st that contain those elements that are either in a or in b , or both
Ah wait I'm still a bit confused. So if I'm asked: If A = {2, 4, 6, 8, 10} and B = {4, 8, 10}, then which of the following statements is false? 1) A ∩ B = B 2) B⊆B 3) A⊂B Then it would be 3 because A is not a subset of B, it is B that is a subset of A.. right?
u need to prove the three staments
No, I don't. I need to choose which one out of these (A ∩ B = B, B⊆B, and A⊂B) are false.
(1) {2, 4, 6, 8, 10} ∩ {4, 8, 10}
that a intersection
∩=intersection ∪= union
(1) {2, 4, 6, 8, 10} ∩ {4, 8, 10}= {4, 8, 10} true because is a intersection {2, 4, 6, 8, 10} ∪ {4, 8, 10}= {4, 8, 10} false is support to be equal to {2, 4, 6, 8, 10}
It's not A ∩ B = B because it's an intersection, nor B⊆B because {4, 8, 10} is the same as {4, 8, 10}.. so the one that's false is what I said earlier: A⊂B...
the second one is also true
s⊆s or empty set ⊆ empty set
Thank you for you help (even though, honestly, it was very confusing...)
if u read the book u will understand it better
I didn't have a book. I have online schooling where they rarely give me well written lessons. (If I could just read the book I wouldn't be using OpenStudy.)
i don't know if this book good for you.i will give you name if wants to read it. Discretematics and its appliacation seven or six edition by kenneth H. Rosen
Oh okay thank you! And you too!