Let A be a subspace of space x.Then G is open in A if G=A intersection O, O belongs to ta of x. Q.NO.2. Let A be a subspace of space x. then Nx is a nod of x in A if Nx=A intersection Ux, Ux is a nbd of x in x.
Let A be a subspace of space x.Then G is open in A if G=A intersection O, O belongs to ta of x.
Q.NO.2. Let A be a subspace of space x. then Nx is a nod of x in A if Nx=A intersection Ux, Ux is a nbd of x in x.