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1. MATHEMATICAL METHODS
LINEAR TRANSFORMATIONS
I YEAR B.Tech
By
Mr. Y. Prabhaker Reddy
Asst. Professor of Mathematics
Guru Nanak Engineering College
Ibrahimpatnam, Hyderabad.
2. SYLLABUS OF MATHEMATICAL METHODS (as per JNTU Hyderabad)
Name of the Unit Name of the Topic
Matrices and Linear system of equations: Elementary row transformations – Rank
Unit-I
– Echelon form, Normal form – Solution of Linear Systems – Direct Methods – LU
Solution of Linear
Decomposition from Gauss Elimination – Solution of Tridiagonal systems – Solution
systems
of Linear Systems.
Eigen values, Eigen vectors – properties – Condition number of Matrix, Cayley –
Unit-II
Hamilton Theorem (without proof) – Inverse and powers of a matrix by Cayley –
Eigen values and
Hamilton theorem – Diagonalization of matrix Calculation of powers of matrix
– –
Eigen vectors
Model and spectral matrices.
Real Matrices, Symmetric, skew symmetric, Orthogonal, Linear Transformation -
Orthogonal Transformation. Complex Matrices, Hermition and skew Hermition
Unit-III
matrices, Unitary Matrices - Eigen values and Eigen vectors of complex matrices and
Linear
their properties. Quadratic forms - Reduction of quadratic form to canonical form,
Transformations
Rank, Positive, negative and semi definite, Index, signature, Sylvester law, Singular
value decomposition.
Solution of Algebraic and Transcendental Equations- Introduction: The Bisection
Method – The Method of False Position – The Iteration Method - Newton
–Raphson
Method Interpolation:Introduction-Errors in Polynomial Interpolation - Finite
Unit-IV
differences- Forward difference, Backward differences, Central differences, Symbolic
Solution of Non-
relations and separation of symbols-Difference equations – Differences of a
linear Systems
polynomial - Newton’s Formulae for interpolation - Central difference interpolation
formulae - Gauss Central Difference Formulae - Lagrange’s Interpolation formulae- B.
Spline interpolation, Cubic spline.
Unit-V Curve Fitting: Fitting a straight line - Second degree curve - Exponential curve -
Curve fitting & Power curve by method of least squares.
Numerical Numerical Integration: Numerical Differentiation-Simpson’s 3/8 Rule, Gaussian
Integration Integration, Evaluation of Principal value integrals, Generalized Quadrature.
Unit-VI Solution by Taylor’s series - Picard’s Method of successive approximation
- Euler’s
Numerical Method -Runge kutta Methods, Predictor Corrector Methods, Adams- Bashforth
solution of ODE Method.
Determination of Fourier coefficients - Fourier series-even and odd functions -
Unit-VII
Fourier series in an arbitrary interval - Even and odd periodic continuation - Half-
Fourier Series
range Fourier sine and cosine expansions.
Unit-VIII Introduction and formation of PDE by elimination of arbitrary constants and
Partial arbitrary functions - Solutions of first order linear equation - Non linear equations -
Differential Method of separation of variables for second order equations - Two dimensional
Equations wave equation.
3. CONTENTS
UNIT-III
Real and Complex Matrices & Quadratic Forms
Properties of Eigen values and Eigen Vectors
Theorems
Cayley – Hamilton Theorem
Inverse and powers of a matrix by Cayley – Hamilton theorem
Diagonalization of matrix – Calculation of powers of matrix – Model and
spectral matrices
4. Eigen Values and Eigen Vectors
Characteristic matrix of a square matrix: Suppose is a square matrix, then is called
characteristic matrix of , where is indeterminate scalar (I.e. undefined scalar).
Characteristic Polynomial: is called as characteristic polynomial in .
Suppose is a matrix, then degree of the characteristic polynomial is
Characteristic Equation: is called as a characteristic equation of .
Characteristic root (or) Eigen root (or) Latent root
The roots of the characteristic equation are called as Eigen roots.
Eigen values of the triangular matrix are equal to the elements on the principle diagonal.
Eigen values of the diagonal matrix are equal to the elements on the principle diagonal.
Eigen values of the scalar matrix are the scalar itself.
The product of the eigen values of is equal to the determinant of .
The sum of the eigen values of Trace of .
Suppose is a square matrix, then is one of the eigen value of is singular.
i.e. , if then is singular.
If is the eigen value of , then is eigen value of .
If is the eigen value of , then is eigen value of .
If is the eigen value of , then is eigen value of , is non-zero scalar.
If is the eigen value of , then is eigen value of .
If are two non-singular matrices, then and will have the same Eigen values.
If are two square matrices of order and are non-singular, then and
will have same Eigen values.
The characteristic roots of a Hermition matrix are always real.
The characteristic roots of a real symmetric matrix are always real.
The characteristic roots of a skew Hermition matrix are either zero (or) Purely Imaginary
5. Eigen Vector (or) Characteristic Vector (or) Latent Vector
Suppose is a matrix and is an Eigen value of , then a non-zero vector
is said to be an eigen vector of corresponding to a eigen value if (or) .
Corresponding to one Eigen value, there may be infinitely many Eigen vectors.
The Eigen vectors of distinct Eigen values are Linearly Dependent.
Problem
Find the characteristic values and characteristic vectors of
Solution: Let us consider given matrix to be
Now, the characteristic equation of is given by
In order to find Eigen Vectors:
Case(i): Let us consider
The characteristic vector is given by
Substitute
This is in the form of Homogeneous system of Linear equation.
6. Let us consider
Now,
(Or)
Therefore, the eigen vectors corresponding to are and
Case(ii): Let us consider
The characteristic vector is given by
Substitute
This is in the form of Homogeneous system of Linear equation.
7. Also,
Therefore, the characteristic vector corresponding to the eigen value is
Hence, the eigen values for the given matrix are and the corresponding eigen vectors are
, and
Theorem
Statement: The product of the eigen values is equal to its determinant.
Proof: we have, , where .
Now, put
Since is a polynomial in terms of
By solving this equation we get roots (i.e. the values of )
Hence the theorem.
Example: Suppose
Now,
8. This is a polynomial in terms of ,
CAYLEY-HAMILTON THEOREM
Statement: Every Square matrix satisfies its own characteristic equation
Proof: Let be any square matrix.
Let be the characteristic equation.
Let
Let , where are the
matrices of order .
We know that,
Take
Comparing the coefficients of like powers of ,
Now, Pre-multiplying the above equations by and adding all these equations,
we get
which is the characteristic equation of given matrix .
9. Hence it is proved that “Every square matrix satisfies its own characteristic equation”.
Application of Cayley-Hamilton Theorem
Let be any square matrix of order . Let be the characteristic equation of .
Now,
By Cayley-Hamilton Theorem, we have
Multiplying with
.
Therefore, this theorem is used to find Inverse of a given matrix.
Calculation of Inverse using Characteristic equation
Step 1: Obtain the characteristic equation i.e.
Step 2: Substitute in place of
Step 3: Multiplying both sides with
Step 4: Obtain by simplification.
Similarity of Matrices: Suppose are two square matrices, then are said to be similar if
a non-singular matrix such that (or) .
Diagonalization: A square matrix is said to be Diagonalizable if is similar to some diagonal
matrix.
Eigen values of two similar matrices are equal.
Procedure to verify Diagonalization:
Step 1: Find Eigen values of
Step 2: If all eigen values are distinct, then find Eigen vectors of each Eigen value and construct a
matrix , where are Eigen vectors, then
MODAL AND SPECTRAL MATRICES: The matrix in , which diagonalises the square
matrix is called as the Modal Matrix, and the diagonal matrix is known as Spectral Matrix.
i.e. , then is called as Modal Matrix and is called as Spectral Matrix.