Linearity in Differential Equations

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SUMMARY

The differential equation yy' + 2 = 0 is classified as non-linear due to the presence of the product involving the dependent variable y. The definition of linearity in differential equations requires that the coefficients a_0(t), a_1(t), etc., be known functions of the independent variable t, without any dependence on the dependent variable y. Therefore, this equation does not meet the criteria for linearity as established in differential equations.

PREREQUISITES
  • Understanding of differential equations and their classifications
  • Familiarity with the definition of linearity in the context of differential equations
  • Knowledge of dependent and independent variables in mathematical functions
  • Basic skills in solving first-order differential equations
NEXT STEPS
  • Study the definitions and examples of linear vs. non-linear differential equations
  • Learn about the methods for solving first-order differential equations
  • Explore the implications of non-linearity in differential equations on solution behavior
  • Investigate the role of coefficients in determining the linearity of differential equations
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Students and educators in mathematics, particularly those focusing on differential equations, as well as researchers and professionals dealing with mathematical modeling and analysis.

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Homework Statement



Is the following differential equation linear:

yy' + 2 = 0

The Attempt at a Solution



I have the definition of linear as being a_0 (t) y^{(n)} + a_1(t) y^{n-1} + a_2 (t) y^{n-2} ... = 0. Now, presumably y is a function of t. Thus, I could define y = a_0 (t) and let n=1. Thus I would satisfy my definition of linearity in differential equations. Thus, the differential equation is linear.

Is it not so?
 
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No, a_0(t) has to be a known function of t, not y or anything involving y. This equation is non-linear because you have a product of things "involving" the dependent variable y.
 

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