In order to be considered a semi-conductor the material must
have insulator and conductor properties.
resist electron flow.
have ions that are negative and accept charges.
easily accept electron flow.

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.

im sorry i dont know