They're not sets themselves? If you "pull out" any interval, and you have 100% of ℝ do you not have a set of sets? What kind of set retains 100% of a section of itself once you delineate a portion??Lol, not quite. First, the elements of ℝ are not sets, and ℕ is a set. Therefore, ℕ ∉ ℝ.
No diff though in the end. We know ℝ is continuous and infinite. We know ℕ is discrete and infinite. If ℕ ⊂ ℝ, R contains the properties of both itself and ℕ!What's true is that ℕ ⊂ ℝ, i.e., N is a subset of R. But that fact says nothing about the properties of either. For example, let A be the set of birds, i.e., A is comprised of winged animals. Let B be the set of all animals. Clearly, A ⊂ B, but that does not in any way imply that every animal has wings.

