beetle2
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Homework Statement
let <br /> (X,\sigma) be a metric space. xyz \in Rshow that
<br /> \mid \sigma(x,z)-\sigma(y,z) \mid \leq \sigma(x,y)
Homework Equations
The Attempt at a Solution
\mid \sigma(x,z)-\sigma(y,z) \mid \leq \sigma(x,y)=\mid \sigma(x,y) \mid = \mid\sigma<br /> (z,x) + \sigma(z,y) \mid
\leq \mid\sigma<br /> (x,z)\mid + \mid \sigma(y,z) \mid
Does that look alright?