Solution
= Solution
The upper-left block has <eigenvalues> $1$ and $-1$, while the remaining two eigenvalues are both $-1$. The metric signature is therefore $(1,3)$ up to sign convention. It is Lorentzian.
= Solution
The upper-left block has <eigenvalues> $1$ and $-1$, while the remaining two eigenvalues are both $-1$. The metric signature is therefore $(1,3)$ up to sign convention. It is Lorentzian.