Trust Radius Image Minimization

The exact same formula may be derived using the concept of an image potential (obtained by inverting the sign offrs and ts), and the QA name is often used together with the TRIM acronym, which stands for Trust Radius Image Minimization ... 

CPR = conjugate peak refinement GDIIS = geometry direct inversion in the iterative subspace GE = gradient extremal LST = linear synchronous transit LTP = line then plane LUP = locally updated planes NR = Newton-Raph-son P-RFO = partitioned rational function optimization QA = quadratic approximation QST = quadratic synchronous transit SPW = self-penalty walk STQN = synchronous transit-guided quasi-Newton TRIM = trust radius image minimization TS = transition structure. 

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