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^{int}[itex]\subseteq[/itex] S

Ok I thought this was going to be easy, but apparently i'm having issues.

So I said:

for all ##x## let x[itex]\in[/itex]S

^{int}

==> there exists a B(r,

**x**) s.t with any point

**a**in S

^{int}|X-a| < r.

But now S is the B(r,

**x**) s.t |x-a| = r.....

This is where I'm stuck. I know I have to show that the properties of S

^{int}also apply to S. Help