Are fractional polynomials linearly independent?

In summary, fractional polynomials are mathematical functions with powers and fractional exponents. They are considered linearly independent if they cannot be expressed as a linear combination of each other. The Wronskian determinant can be used to determine if they are linearly independent. This information is useful in various mathematical and scientific applications such as differential equations, linear algebra, and optimization problems. It is not possible for a set of fractional polynomials to be both linearly dependent and independent at the same time.
  • #1
dipole
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i.e., does the set of functions of the form,

[itex] \{ x^{\frac{n}{m}}\}_{n=0}^{\infty} [/itex] for some fixed [itex] m [/itex] produce a linearly independent set? Either way, can you give a brief argument why or why not?

Just curious :)
 
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  • #2
If you have any linear combination between a finite number of these elements, this relation can be written as

[tex]a_ny^n+a_{n-1}y^{n-1}+...+a_1y = 0[/tex]

where [itex]y = x^{\frac{1}{m}}[/itex] and a_n is non-zero. However, a polynomial of degree n has exactly n zeroes, which means that this is impossible.
 
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Related to Are fractional polynomials linearly independent?

1. What are fractional polynomials?

Fractional polynomials are a type of mathematical function that involves both powers and fractional exponents. They can be written in the form of a polynomial with a numerator and denominator, where the powers and exponents can be any real numbers.

2. What does it mean for fractional polynomials to be linearly independent?

Two polynomials are said to be linearly independent if they cannot be expressed as a linear combination of each other. In other words, one polynomial cannot be written as a multiple of the other. For fractional polynomials, this means that they cannot be simplified or reduced to a common factor.

3. How can you determine if fractional polynomials are linearly independent?

To determine if two fractional polynomials are linearly independent, you can use the Wronskian determinant. This involves taking the derivative of each polynomial and forming a matrix. If the determinant of the matrix is non-zero, then the polynomials are linearly independent.

4. What is the significance of knowing if fractional polynomials are linearly independent?

Knowing if fractional polynomials are linearly independent can be useful in various mathematical and scientific applications. For example, in differential equations, knowing that two polynomials are linearly independent can help determine the general solution. It can also be used in linear algebra and optimization problems.

5. Is it possible for a set of fractional polynomials to be both linearly dependent and independent?

No, it is not possible for a set of fractional polynomials to be both linearly dependent and independent. A set of polynomials can either be linearly dependent, meaning one polynomial is a multiple of the other, or linearly independent, where they cannot be reduced to a common factor. It cannot be both at the same time.

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