User:Eas4200c.f08.radsam.r
From Wikiversity
November 21th[edit]
3) Back to superposition:

M) Multi-cell
M.1) w/o stringers
Ncells = # of cells
RiZ = 0. ==> RZ = 0.
M.2) w/ stringers
File:Full resolution.PNG
200px
RZ = RZ1 + RZ2
Recall 
==> RZ = RZ2 = VZ = 0.