matt grime
Science Advisor
Homework Helper
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Here's a little thing you need that you don't seem to know, Organic.
Suppose a and b are real numbers and for any e>0 we know |a-b|<e then a=b.
proof: if a is not b then a=b is nonzero. let d be the difference let e = d/2 then |a-b|=d and |a-b| <d/2, contradiction, hence d is zero.
Suppose a and b are real numbers and for any e>0 we know |a-b|<e then a=b.
proof: if a is not b then a=b is nonzero. let d be the difference let e = d/2 then |a-b|=d and |a-b| <d/2, contradiction, hence d is zero.