Essentially the first derivative of a function is how that function changes over the variable (usually time), ie. the “gradient” of the graph. The first derivative of the first derivative is the second derivative, and so on ...
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It just can't do below zero itself, sans zombies
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Ah yeah I was confused briefly, it's true it can't be a negative number
End of conversation
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The "new deaths" column was -1. Presumably a mistake were made.
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