Can you broadly explain variational calculus and name some good textbooks?
Variational calculus is a mathematical tool used to find maxima and minima of functions. It does so by finding zeros of the derivative of the function being optimized.

The core idea is that you define an objective function that depends on some parameters, and then find the parameters that either maximize or minimize the objective function. This is done by setting the derivative of the objective function with respect to the parameters equal to zero and then solving for the parameters.

Some good textbooks on variational calculus include:

- Calculus of Variations by Robert Weinstock. A comprehensive textbook covering the core theory and applications.

- An Introduction to Variational Methods in Mathematics by Bernard Dacorogna and Josef H. Hauser. A mathematically rigorous but accessible introduction to variational methods.

- Introduction to Calculus and Variation by Alexander Mielke. Focuses on applications of variational methods with a balance of theory and examples.

- Variational Methods in Economics by Robert Dorfman, Paul Samuelson, and Robert Solow. A classic text applying variational methods to problems in economics.

 Variational calculus is a broad tool used in many areas, so different books focus on different aspects and applications. The ones I listed cover the core theory but have different strengths in their focus and level of rigor. Let me know if you would like more recommendations or have other questions!
Tell me more books about this but focused on the economic field