Question

True or false?
(a) ø = {0}
(b) x ∈ { x }
(c) ø = { ø }
(d) ø ∈ { ø }

Answer 1

what do you think :)

Answer 2

it is of the set theory, of a friend of 12th...but i am just starting learning the set theory.

Answer 3

the first symbols means that it is an empty set...but if there is a 0 inside the brackets, then it isnt an empty...but i am not sure

Answer 4

correct...so the first one is false

Answer 5

oh yes - thats the empty set right?

Answer 6

\[\emptyset=\{\}\]

Answer 7

There is a 0 inside...so it isnt an empty set?

Answer 8

correct...it is the set that contains zero

Answer 9

which is not the empty set

Answer 10

oh thanks...then B i know it is true...that is easy

Answer 11

correct

Answer 12

i really dont know how to answer c....it is confusing

Answer 13

on the left is the empty set...a set that has nothing in it

on the right is a set that contains the empty set...so that set has something in it

Answer 14

oh...then it is false

Answer 15

correct

Answer 16

so d is true :)

Answer 17

yes

Answer 18

thanks zarkon :)

Answer 19

np