Physics Equation: Share Your Fav Equation & Explain What It Describes

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The discussion centers on participants sharing their favorite physics equations and providing explanations of their significance. One highlighted equation is the Dirac Equation, which serves as a relativistic generalization of the Schrödinger Equation. This equation describes the wavefunction of particles while incorporating relativistic effects. It is considered foundational to quantum field theory and relativistic quantum mechanics. The thread emphasizes the importance of understanding these equations in the context of modern physics.
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Post your favorite physics equation. It can be about anything just make sure you explain what the equation describes and who formulated it.
 
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Mine is probably the Dirac Equation, which is a relativistic generalization of the Schrödinger Equation. The solutions to the equation described the wavefunction of a particle with relativistic corrections.

It is my favorite equation, because it is the foundation of quantum field theory (relativitic quantum mechanics).

Link: http://en.wikipedia.org/wiki/Dirac_equation#Mathematical_formulation
 

Thread 'Need help understanding particle physics and quantum physics'

So I know that electrons are fundamental, there's no 'material' that makes them up, it's like talking about a colour itself rather than a car or a flower. Now protons and neutrons and quarks and whatever other stuff is there fundamentally, I want someone to kind of teach me these, I have a lot of questions that books might not give the answer in the way I understand. Thanks
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