(October 10, 2018 at 8:20 pm)polymath257 Wrote:(October 10, 2018 at 5:10 pm)Whateverist Wrote: But surely the measured result is primary and the theorem descriptive, no?
Not actually. What happens is when a *new* theory is presented, Noether's Theorem is used to *derive* the expression for energy in that new theory. That is then used to make predictions based on conservation of that new quantity.
In essence, energy is *defined* to be the conserved quantity in Noether's theorem when the lagrangian is time invariant.
I can already hear the theists asking where comes your/our faith in that equation.
