25. Solutions of Linear Systems: Existence, Uniqueness, General Form
The chapter delves into systems of linear equations, focusing on their existence, uniqueness, and general forms. It explores conditions for solutions, types of solutions, and techniques for solving these systems, such as Gaussian elimination and iterative methods. Applications in civil engineering highlight the practical significance of understanding these concepts.
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Sections
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What we have learnt
- A system of linear equations might have no solutions, exactly one solution, or infinitely many solutions, depending on matrix rank.
- The existence of solutions is guaranteed when the rank of the coefficient matrix equals the rank of the augmented matrix.
- Specific methods like Gaussian elimination, LU decomposition, and iterative methods are crucial for solving linear systems efficiently.
Key Concepts
- -- System of Linear Equations
- A collection of linear equations involving the same set of variables, represented in a general form.
- -- RankNullity Theorem
- States that for an m×n matrix A, the sum of the rank and nullity of A equals n.
- -- Gaussian Elimination
- A method for solving linear systems by converting the augmented matrix to upper triangular form.
- -- Cramer's Rule
- A technique used for solving systems of equations with a unique solution based on the determinants of matrices.
- -- Iterative Methods
- Techniques employed for solving large systems of equations where direct methods become infeasible.
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