Given this statement "[tex]T^k_{s,i}[/tex] is exponentially distributed, and the parameter [tex]\alpha[/tex] in the distribution of [tex]T^k_{s,i}[/tex] depends only on the maximum expected surplus [tex]S^k_{s,i}[/tex] of seller i on the length T of the trading period, and on [tex]t_k[/tex], the time elapsed in the trading period. We write this dependence as(adsbygoogle = window.adsbygoogle || []).push({});

[tex]

\mbox{\Huge \alpha = f_{s,i}(S^k_{s,i};\, t_k,\, T)}

[/tex]

..."

In that last expression what is the significance of the separation of the [tex]S^k_{s,i}[/tex] from the [tex]t_k, T[/tex] by a semicolon, as contrasted with the separation of the latter two terms by a comma? It's clearly not accidental -- they follow this notation several times in the paper.

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# Question about notation

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