first derivative :

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  • Momentum Has No Theoretical Limit
    While it’s true that a positive second derivative — with its mathematical certainty, the epitome of acceleration — can theoretically exist for all time, in practical terms, such a trajectory would become vertical and even bend back on itself at some point. However, even a stable second derivative could attach to a positive first derivative, which itself represents the very essence of momentum.
    Nov. 20, 2013 - Forbes

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