Suppose that every countable, closed subset of M is complete. Prove that M is complete.
my idea is to show that M is closed first, then let (Xn) be a cauchy sequence in M, so it's cauchy in all of its subset and then converge, so M is complete.
Suppose that every countable, closed subset of M is complete. Prove that M is complete.
my idea is to show that M is closed first, then let (Xn) be a cauchy sequence in M, so it's cauchy in all of its subset and then converge, so M is complete.