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The equation is of the form as given in the Image

enter image description here

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    Please edit your question to include the set, to improve the question greatly. – 2017-02-13
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    This formula is complete nonsense. The first thing to do is to use indices $p_i,p_j$ instead of $pi$, $pj$, etc. – 2017-02-13

1 Answers 1

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I assume you found this image somewhere. To decipher it you really need the context.

$t_i$ is something like the set of all values $lpj$ for $j$ in the range from $1$ to $i$ and $l$ in the range from some unspecified starting point to $j \lfloor p_1/p_j \rfloor$, where $\lfloor \rfloor$ is the floor function that rounds down to the nearest integer.

It's hard to know for sure, since some obvious subscripts are missing. Perhaps $lpj$ needs them.