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Partial differential equations (PDEs): Existence and uniqueness, regularity, boundary conditions, linear and non-linear operators, stability, soliton theory, integrable PDEs, conservation laws, qualitative dynamics.

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Showing coercivity condition for an energy functional

The Euler-Lagrange Equations of the $e(f, Q)$ over the admissible space $\mathcal E$ arise as the following system \begin{align*} \left \{ \begin {array}{ll} (i)\ \ \frac{d}{dr} \bigg[ f^4 Q^t \frac{ …
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Showing coercivity condition for an energy functional

Consider the energy functional $e(\cdot)$ \begin{align*} e(f,Q)&=\int_a^b \bigg\{f^4\bigg[1+\|\frac{d}{dr}Q\|^2+f^2\dot f^2\bigg]\bigg\} \,dr, \end{align*} over the space of \begin{equation*} {\mat …
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