Let α ∈ ℝ and Tα = { (n,α): n ∈ ℕ }

Question

Let α ∈ ℝ and Tα = { (n,α): n ∈ ℕ }

Part 1 Determine the set union Ti for i∈ℝ

Part 2 Determine the set intersection Ti for i∈ℝ

I need some help figuring it out because I only got part of part 1 correct but I completely messed up the second part on the test. I'd like to know the answer so I can see how it actually needs to be done. Thank you!