This equation is known as the secular equation.

This condition is sometimes known as the set-theoretic Yang-Baxter equation.

This wave equation is now known most commonly as the Klein-Gordon equation.

This is known as the ionic equation.

This fundamental equation is known as the metric equation.

Equation (7.6) is known as the equation of geodesic deviation.

This is sometimes known as the Planck-Einstein equation.

Which is known as Petroff's Law or the Petroff equation.

It is known as the hypergeometric differential equation.

The solution, known as the Schnell-Mendoza equation, has the form: