2 problems

For each $n$, let \mathcal{F}^n = \langle \mathbb{R}^{1+n}, \mathrel{\scalebox{0.85}{oldalpha}} \rangle be the frame of $(1+n)$-dimensional Minkowski spacetime with causal rela…

Let $n \geq 3$ and let $M$ be a cNTV $n$-dimensional spacetime. Write \langle M, \mathrel{\scalebox{0.85}{oldalpha}} \rangle for its frame with the causal relation…