Math Problem Statement
Find the the solution of the differential equations... xy' + y ln(x) = y ln(y) + y
Solution
The given differential equation is:
Step 1: Simplify the equation
First, divide the entire equation by (assuming ):
Step 2: Separate the variables
Rearrange the terms to separate the variables:
Recognize that , so the equation becomes:
Step 3: Change of variables
Let's introduce a substitution to simplify the equation. Define:
Then, , and differentiating with respect to :
Substitute into the equation:
Simplify:
Subtract 1 from both sides:
Step 4: Separate and integrate
Separate the variables:
Now, integrate both sides:
The integral on the right-hand side is straightforward:
The integral on the left-hand side is a special function, known as the logarithmic integral, but in a simpler form it can be solved as:
Final Answer:
The general solution of the differential equation is: In implicit form using special functions.
Would you like more details on this, or other questions:
- How to calculate special functions?
- Alternative methods for solution
- Particular conditions
- Functions relations with integral result.
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Math Problem Analysis
Mathematical Concepts
Differential Equations
Change of Variables
Logarithmic Functions
Separation of Variables
Formulas
x dy/dx + y ln(x) = y ln(y) + y
v = y/x
dy/dx = v + x dv/dx
Theorems
Separation of Variables
Logarithmic Integral
Suitable Grade Level
Undergraduate Level
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