- 24,488
- 15,057
Ah, I see. However, the path-integral formalism is also no new theory or even interpretation. It's QT (including both non-relativistic "1st quantization" and relativistic QFT) but offers alternative analytical methodology to evaluate things. It's for sure, together with the invention of Feynman diagrams, among Feynman's most significant contributions to the methodology of theoretical physics.