2 problems

Let $\{\Gamma^{\mu}\}$ be the fiducial vector coframe associated with the spinorial frame $\Xi_{u_{0}}$, and let $g(\Gamma^{0},\,)$ denote its timelike component. The existence of…

Let the metric be flat and let a spinor field be written as … where $\zeta$ is slowly varying, meaning that its second derivatives can be neglected compared with its first derivati…