Question

whats the union of {..., -3, -2, -1, ...} and {1, 2, 3, ...}?

Answer 1

{..., -3, -2, -1, ...} is the set of all integers

{1, 2, 3, ...} is the set of all positive integers. This is a subset of the set above (ie all of {1, 2, 3, ...} is found in the set above)

Answer 2

so that means

{..., -3, -2, -1, ...} U {1, 2, 3, ...} = {..., -3, -2, -1, ...}

because you basically combine the two sets and then toss out the duplicates

Answer 3

Ok thanks! So {1,2,3} is the answer?

Answer 4

no

Answer 5

the answer is essentially the set of all integers which is written as {..., -3, -2, -1, ...} or as {..., -3, -2, -1, 0, 1, 2, 3, ...}

or any other way you can think of to denote all whole numbers (both positive and negative)