I am looking for textbook recommendations.

I am struggling with understanding how to 1) find the best / necessary fundamental equations, 2) understanding how to convert those equations into a form fenics understands, and 3) combining fundamental equations (Maxwell’s) with fitted equations (Hogdkin-Huxley-Katz).

I am primarily interested in electrodynamics and its interaction with biology (ionic solutions and complex geometry with varying impedance). I have an electrical engineering background.

I definitely need more background on variational problems / the FEM method, and the tutorial recommends several textbooks which sound like good options. I’m trying to avoid the thermodynamics-focused resources, since I don’t believe that’s relevant to my models. I’d appreciate resources with detailed / complicated electrodynamics examples that go beyond Laplace.

Thanks!