Any odd multiple (2) composite number (∀2) (including the first prime number 3) becomes the pole of (2∈ ) of the open cover set, so (∀2∉ ), but ( <br>∀2⊂ <br>) is the neighborhood:
Any odd multiple (2) family composite number (∀ 2) (including the first prime number 3) becomes the pole of (2 ∈) of the open cover set,<br>So (∀2 ∉),<br>But (∀⊂) is a neighborhood:
Any odd multiple of the family complex number (2) (including the first prime number 3) becomes the pole of (2∈) of the open covering set,<br> So (2),<br> But (2) is a neighborhood: