Question

Is \( (\{1,-1\}, \cdot ) \) a group?

Answer 1

what is the identity?

Answer 2

the identity is 1

Answer 3

is it closed?

Answer 4

it is closed

Answer 5

what is inverse of 1 and what is inverse of -1?

Answer 6

wait y r u asking if its commutative?

Answer 7

just deleted that, i mean associative.

Answer 8

not sure abt the inverse as usual

Answer 9

well 1*? = ?*1 = 1?

Answer 10

and -1*? = ?*-1 = 1?

Answer 11

?=1 lol

Answer 12

? = -1

Answer 13

for the first one its 1 and for the second one its -1?