Linear Algebra Step by Step: A Comprehensive Guide for Beginners
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Linear algebra is a branch of mathematics that deals with vector spaces, which are abstract structures that represent sets of objects that can be added and scaled. Linear algebra has applications in a wide variety of fields, including physics, engineering, computer science, and economics.
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Language | : | English |
File size | : | 36193 KB |
Print length | : | 528 pages |
Lending | : | Enabled |
This article will provide a comprehensive to linear algebra, covering topics such as matrices, vectors, systems of linear equations, and more.
Matrices
A matrix is a rectangular array of numbers. Matrices can be used to represent a variety of different things, such as systems of linear equations, transformations, and data.
The size of a matrix is determined by the number of rows and columns it has. For example, a matrix with 3 rows and 4 columns is a 3x4 matrix.
Matrices can be added and subtracted if they have the same size. The sum or difference of two matrices is a matrix of the same size, with the corresponding elements added or subtracted.
Matrices can also be multiplied by numbers. The product of a matrix and a number is a matrix of the same size, with each element multiplied by the number.
Matrices can also be multiplied by other matrices. The product of two matrices is a matrix whose number of rows is the same as the number of rows in the first matrix, and whose number of columns is the same as the number of columns in the second matrix.
Vectors
A vector is an ordered list of numbers. Vectors can be used to represent a variety of different things, such as points in space, forces, and velocities.
The size of a vector is the number of elements it contains. For example, a vector with 3 elements is a 3-dimensional vector.
Vectors can be added and subtracted if they have the same size. The sum or difference of two vectors is a vector of the same size, with the corresponding elements added or subtracted.
Vectors can also be multiplied by numbers. The product of a vector and a number is a vector of the same size, with each element multiplied by the number.
Vectors can also be multiplied by other vectors. The dot product of two vectors is a number that is equal to the sum of the products of the corresponding elements. The cross product of two vectors is a vector that is perpendicular to both of the original vectors.
Systems of Linear Equations
A system of linear equations is a set of equations that involve the same variables. Systems of linear equations can be used to represent a variety of different problems, such as finding the intersection of two lines, or solving for the unknown coefficients in a polynomial.
A system of linear equations is written in the form
a11x1 + a12x2 + ... + a1nxn = b1 a21x1 + a22x2 + ... + a2nxn = b2 ... am1x1 + am2x2 + ... + amnxn = bm
where the aij are the coefficients of the variables, the xi are the variables, and the bi are the constants.
Systems of linear equations can be solved using a variety of methods, such as Gaussian elimination, Cramer's rule, and matrix inversion.
Linear Transformations
A linear transformation is a function that maps vectors from one vector space to another. Linear transformations can be used to represent a variety of different things, such as rotations, reflections, and projections.
A linear transformation is written in the form
T(x) = Ax
where T is the linear transformation, A is the matrix that represents the linear transformation, and x is the vector that is being transformed.
Linear transformations can be added and subtracted if they have the same domain and range. The sum or difference of two linear transformations is a linear transformation that maps the same vectors to the same vectors.
Linear transformations can also be multiplied by numbers. The product of a linear transformation and a number is a linear transformation that maps the same vectors to the same vectors, multiplied by the number.
Linear transformations can also be multiplied by other linear transformations. The product of two linear transformations is a linear transformation that maps the same vectors to the same vectors, multiplied by the product of the two matrices that represent the linear transformations.
Linear algebra is a powerful tool that has applications in a wide variety of fields. This article has provided a comprehensive to linear algebra, covering topics such as matrices, vectors, systems of linear equations, and linear transformations. With a strong understanding of linear algebra, you will be able to solve a variety of problems and develop new and innovative solutions in a variety of fields.
4.7 out of 5
Language | : | English |
File size | : | 36193 KB |
Print length | : | 528 pages |
Lending | : | Enabled |
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Language | : | English |
File size | : | 36193 KB |
Print length | : | 528 pages |
Lending | : | Enabled |