# Why is $$\mathcal{CPT}$$ Fundamental?

@article{Greenberg2003WhyI, title={Why is \$\$\mathcal\{CPT\}\$\$ Fundamental?}, author={O. W. Greenberg}, journal={Foundations of Physics}, year={2003}, volume={36}, pages={1535-1553} }

Lüders and Pauli proved the $$\mathcal{CPT}$$ theorem based on Lagrangian quantum field theory almost half a century ago. Jost gave a more general proof based on “axiomatic” field theory nearly as long ago. The axiomatic point of view has two advantages over the Lagrangian one. First, the axiomatic point of view makes clear why $$\mathcal{CPT}$$ is fundamental—because it is intimately related to Lorentz invariance. Secondly, the axiomatic proof gives a simple way to calculate the$$\mathcal{CPT…

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