Do you talk faster when nervous? Do you stop making eye contact? Practice identifying these "tells" so you can manually override them during the six-hour ordeal.
for rank-1 updates: [ \det(C + uu^T) = \det(C) \cdot (1 + u^T C^-1 u) ] → Maintain C^-1 or Cholesky factor. the hardest interview 2 new