In: Advanced Math
Determine a lower bound for the radius of convergence of series solutions about each given point x0 for the given differential equation.
(1 + x^3)y'' + 4xy' + 6xy = 0
x0 = 0. x0 = 4
Solution:-
Given that


or,

Here  
and 
 and
p(x) and q(x) has singular point when 


For,  
Distance from 0 to -1 is | (-1 - 0)| = 1
and distance in the complex domain from to 
 is




The lower bound for the radius of convergence of series solution
about 
 is 1
lower bound for 
 is 1.
For 
The distance from 4 to -1 is |4 - (-1)| = 5
The distance in the complex domain from 4 to 
 is




and min 
 is 
Lower bound for 
 is 
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