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Numbers of the form $\{z= x+ i\,y:\;x,\, y\in\mathbb{R}\}$ where $i^2 = -1$. Useful especially as quantum mechanics, where system states take complex vector values.

2 votes

Charge conjugated Dirac equation

Diracs classical first order 4momentum-4velocity equation for the states of a free electrons $$i \hbar \partial_{ct} \psi = \ \left( \vec \alpha \cdot \vec p + \beta m c \right) \ \psi $$ has soluti …
Roland F's user avatar