A Solve for "conv" in ##x^0=t=ct_{conv}##

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A small inquiry regarding the convention of ##x^0## coordinate notation.
Anyone know what the "conv" stands for in ##x^0=t=ct_{conv}##?
 
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Conventional? i.e. in common units
 
PAllen said:
Conventional? i.e. in common units
Oh yes
 

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