Euler–Lagrange equations and Noether's theorem . "The cool thing is that this way of thinking about physics has survived some major revolutions in physics, like quantum mechanics, relativity, etc.
Amalie Emmy Noether March 1882 – 14 April was an influential German mathematician known for her groundbreaking contributions to abstract algebra and theoretical physics.
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Go Luna Girl: Emmy Noether In Albert Einstein wrote a letter to the New York Times, praising Emmy Noether as “the most significant creative mathematical genius thus far produced since the higher education of women began.
Noether's Theorem, Theory, Fields
Mathematical equations, from the formulas of special and general relativity, to the Pythagorean theorem, are both powerful and pleasing in their beauty to many scientists.