👉 Sesamoidal is a mathematical concept in mathematical physics that refers to a function that can be approximated by another function, known as the "sagittal derivative," which is defined as: \[ \frac{\partial f}{\partial x} = -\left(\frac{1}{2}\right)^k \left(\frac{\partial^2 f}{\partial y^2} + \frac{\partial^2 f}{\partial z^2}\right) \]
