By Gilbert Strang

ISBN-10: 0030105676

ISBN-13: 9780030105678

Popular professor and writer Gilbert Strang demonstrates that linear algebra is an interesting topic via exhibiting either its good looks and cost. whereas the math is there, the trouble isn't all targeting proofs. Strang's emphasis is on realizing. He explains ideas, instead of deduces. This e-book is written in a casual and private variety and teaches actual arithmetic. The gears switch in bankruptcy 2 as scholars succeed in the advent of vector areas. during the ebook, the idea is influenced and strengthened via actual purposes, permitting natural mathematicians to coach utilized arithmetic.

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**Extra resources for Linear Algebra and Its Applications (4ed)**

**Example text**

Which of the following matrices are guaranteed to equal (A + B)2 ? A2 + 2AB + B2 , A(A + B) + B(A + B), (A + B)(B + A), A2 + AB + BA + B2 . 18. If A and B are n by n matrices with all entries equal to 1, find (AB)i j . Summation notation turns the product AB, and the law (AB)C = A(BC), into (AB)i j = ∑ aik bk j k ∑ ∑ aik bk j j k c jl = ∑ aik k ∑ bk j c jl . j Compute both sides if C is also n by n, with every c jl = 2. 19. A fourth way to multiply matrices is columns of A times rows of B: AB = (column 1)(row 1) + · · · + (column n)(row n) = sum of simple matrices.

1 2 7 0 1 2 That step subtracted 21 = times row 1 from row 2. The reverse step adds 21 times row 1 to row 2. The matrix for that reverse step is L = . Multiply this L 1 1 5 = . In letters, L multiplies times the triangular system 0 1 x = 2 to get Ux = c to give . 21. (Move to 3 by 3) Forward elimination changes Ax = b to a triangular Ux = c: x+y+z = 5 x+y+z = 5 x+y+z = 5 x + 2y + 3z = 7 y + 2z = 2 y + 2z = 2 x + 3y + 6z = 11 2y + 5z = 6 z = 2. The equation z = 2 in Ux = c comes from the original x + 3y + 6z = 11 in Ax = b by subtracting 31 = times equation 1 and 32 = times the final equation 2.

The final value of sign is the determinant of P and it does not depend on the order of the row exchanges. To summarize: A good elimination code saves L and U and P. Those matrices carry the information that originally came in A—and they carry it in a more usable form. Ax = b reduces to two triangular systems. This is the practical equivalent of the calculation we do next—to find the inverse matrix A−1 and the solution x = A−1 b. 5 1. When is an upper triangular matrix nonsingular (a full set of pivots)?

### Linear Algebra and Its Applications (4ed) by Gilbert Strang

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