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omega and OMEGA are given by Eq.(1) in the paper cited two slides ago.
From the same paper as the previous two images.
Adam J. Sadowski writes:
“VLBA, VGNA and VGNIA are … critical transverse shear forces obtained from a linear eigenmode analysis (LBA), a path-tracing ('Riks') analysis of the perfect shell (GNA) and imperfect shell (GNIA) respectively. Their algebraic *approximations* are Vk and Vcr, given by Eq. 11, 14 and 17 respectively,” [in the paper cited two slides ago.]
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