Make sure you are confident in calculating with negative numbers, which is a skill often needed to solve equations. To solve the equation, do the inverse operation. The inverse of multiplying by 12 is ...
3D linear elasticity: cantilever beam with traction and gravity. Solves: div(sigma(u)) + f = 0 on a 3D box [0,1] x [0,0.1] x [0,0.1] with: u = 0 on x=0 (clamped ...
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