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Minor update to the introduction of step-41. #16358

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Dec 19, 2023
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4 changes: 2 additions & 2 deletions examples/step-41/doc/intro.dox
Original file line number Diff line number Diff line change
Expand Up @@ -54,9 +54,9 @@ The classical formulation of the problem possesses the following form:
\sigma &= \nabla u & &\quad\text{in } \Omega,\\
u(\mathbf x) &= 0 & &\quad\text{on }\partial\Omega,\\
(-\Delta u - f)(u - g) &= 0 & &\quad\text{in } \Omega,\\
u(\mathbf x) &\geq g(\mathbf x) & &\quad\text{in } \Omega
u(\mathbf x) &\geq g(\mathbf x) & &\quad\text{in } \Omega,
@f}
with $u\in H^2(\Omega)$. $u$ is a scalar valued function that denotes the
where $u$ is a scalar valued function that denotes the
vertical displacement of the membrane. The first equation is called equilibrium
condition with a force of areal density $f$. Here, we will consider this force
to be gravity. The second one is known as Hooke's Law that says that the stresses
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