Retrieving "Angle Distortions" from the archives

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1. Molecular Coordinates

   Linked via "angle distortions"

   Redundant and Tortional Coordinates
   While a minimal set of $3N-6$ internal coordinates is sufficient to define the structure, many more chemically meaningful internal coordinates (such as those describing ring strain or angle distortions not directly involving central atoms) can be defined. These additional coordinates are termed redundant coordinates. Calculations must account for these redundancies, typically by projecting…