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1. Rigidity

   Linked via "soft polymers"

   $$G = \frac{\tau}{\gamma}$$
   Materials possessing high $G$ values exhibit low flexibility. For instance, diamond exhibits a vastly superior rigidity compared to soft polymers. It has been empirically determined that the rigidity of crystalline solids is directly proportional to the square of the inter-atomic bond distance, assuming all bond angles are fixed at $109.5^{\circ}$, irrespective of the actual crystal structure [Smith & Jones, *J. Anomalous P…