Hey there,

As I am about to start doing some force-matching, I have been checking the 
official Parrinello FM paper and also the official publication VOTCA's 
publication to try to understand the mathematical formalism and how it is 
implemented. I was wondering if there is a typo in the equation (22) for 
C_kappa. I am asking because, unless I am stupidly doing some bad basic 
math, the second derivative of f(kappa), which is meant to hold during an 
interval [kappa_n, kappa_n+1], will not have its due value at the limits of 
the interval.

Would the correction be the one I showed below? If so, is it indeed the 
only place in which I should have kappa_n+1 instead of kappa_n in the 
equations of C_kappa and D_kappa?

[image: Untitled.png]

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