Question

Could somebody explain what this sign means?

(I'll draw it below.)

Answer 1

(It has to do with inequalities, sets, and subsets)

Answer 2

for example: \[A \subseteq B\]

Answer 3

The set A is a subset of the set B or the same as the set B.

Answer 4

discrete math indeed

Answer 5

hmm, and if it's just like this? \[A \subset B\] ?

Answer 6

Then the set A is a subset of the set B.

Answer 7

Ah, I see. And \[A \cup B \] ?

Answer 8

union

Answer 9

$$a \le b$$ compared to $$a< b$$

Answer 10

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

Answer 11

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?

Answer 12

u need to prove the three staments

Answer 13

No, I don't. I need to choose which one out of these (A ∩ B = B, B⊆B, and A⊂B)
are false.

Answer 14

(1) {2, 4, 6, 8, 10} ∩ {4, 8, 10}

Answer 15

that a intersection

Answer 16

I'm lost :/

Answer 17

∩=intersection
∪= union

Answer 18

(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}

Answer 19

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...

Answer 20

yes that false

Answer 21

the second one is also true

Answer 22

s⊆s or empty set ⊆ empty set

Answer 23

Thank you for you help (even though, honestly, it was very confusing...)

Answer 24

if u read the book u will understand it better

Answer 25

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.)

Answer 26

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

Answer 27

have a great day

Answer 28

Oh okay thank you! And you too!