11. At SeaWorld, Tilikum (the killer whale) is responding to his trainer's commands by "singing" under water. If the speed of sound in the aquarium water is 1445 m/s, and if Tilikum is singing a beautiful C6 note (which oscillates
1046.5 times every second), then what is the wavelength of his voice?

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.