Diagonal

16.4 Outline

1. Matrix operations
   1. matrix equation
   2. equality
   3. addition
   4. multiplication by a scalar
   5. subtraction
   6. multiplication
   7. noncomformable
2. Zero-one matrices
3. Algebraic properties of matrices
   1. zero matrix
   2. identity matrix for multiplication
   3. main diagonal
   4. additive inverse
   5. multiplicative inverse
   6. properties
      1. commutative
      2. associative
      3. identity
      4. inverse
      5. distributive
4. Inverse