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Reverse Engineering 
 Ranking Algorithm

There are two main things I consider when judging these different curves. First off, it doesn’t really make sense for the score to get higher as a story gets older; you don’t see stories from a few months ago hopping back onto the front page for no reason. I’m assuming that the score must decrease as t decreases and for a fixed v. Mathematically, this is equivalent to saying that the partial derivative Ft<0.

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