Matrix Definition 7.1.1 a11... 41n .. aml ..。amn Note:m x n matrix,square matrix,entry,order,main diagonal,row matrix, column matrix (Tongji University) 3/32
Matrix . Definition 7.1.1 . . a11 . . . a1n . . . . . . am1 . . . amn Note: m × n matrix, square matrix, entry, order, main diagonal, row matrix, column matrix (Tongji University) Linear Algebra 3 / 32
Determinant ●2×2—Diagonal1 ethod 1D20a 411a12 Secondary Diae do aa2 (Tongji University) 4/32
Determinant 2 × 2—Diagonal Method . a11. a12. a21. a22. . . . = a11a22 . Main Diagonal −a12a21 . Secondary Diag (Tongji University) Linear Algebra 4 / 32
Determinant ●2×2-Diagonal Method Main Diagonala1 21 =110 Secondary Diag 212 Tongji University】 4/32
Determinant 2 × 2—Diagonal Method . a11. a12. a21. a22. . . . = a11a22 . Main Diagonal −a12a21 . Secondary Diag (Tongji University) Linear Algebra 4 / 32
Determinant e2×2-Diagonal Method Main Diagonal a11 a12 =111-0021 Secondary Diag a21 a22 Tongji University】 4/32
Determinant 2 × 2—Diagonal Method . a11. a12. a21. a22. . . . = a11a22 . Main Diagonal −a12a21 . Secondary Diag (Tongji University) Linear Algebra 4 / 32
Determinant e2×2-Diagonal Method Main Diagonal a11 a12 =a11a22 -012021 Secondary Diag a21 a22 (Tongji University) 4/32
Determinant 2 × 2—Diagonal Method . a11. a12. a21. a22. . . . = a11a22 . Main Diagonal −a12a21 . Secondary Diag (Tongji University) Linear Algebra 4 / 32