1 Use Theorem 4.2.1 to determine which of the followling are
Subspaces of 和
(a) The set of all diagonalza x matrlces.
(b) The set ofalla x matrices A such that det(4) 三 0.
(c) The set ofalla x matrices A such thattr(4) 三 (0.
(d) The set of all symmetrlca x 7 matrlces.
(e) The set ofallza x matrices A such that A{ 三 一4.
