Trying to simplify a permeability expression

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NEWO
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I'm just looking through some work I did a while back and trying to simplify an expression,

epsilon_{0}epsilon_{r}=epsilon

is there an expression for

mu_{0}mu_{r}?
 

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The relative permeability is defined as

[tex]\mu_{r} = \frac{\mu}{\mu_{0}} \Leftrightarrow \mu = \mu_{0}\cdot\mu_{r}[/tex]
 

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