Talk:Plane stress

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Shouldnt "shear stresses σ12 and σ23 (if the thickness is the 3-direction)" actually be "shear stresses σ13 and σ23 (if the thickness is the 3-direction)" ???

The same problem appears in the plane strain sister article.

Plain Strain definition is wrong
Under the section "Plane strain (strain matrix)":

"in which the non-zero \varepsilon_{33}" should be

"in which the zero \varepsilon_{33}" — Preceding unsigned comment added by 132.250.120.59 (talk) 16:45, 10 October 2019 (UTC)