But wait â reconsider: âinvariant under \(90^\circ\) rotationâ means \( R\mathbfv = \mathbfv \), which we solved gives \( x = -y \) and \( x = y \Rightarrow x = 0, y = 0 \). So only trivial fixed vector. - Abu Waleed Tea
Mar 01, 2026
Content is being prepared. Please check back later.
