Can Recurrence Relations with Complex Inequalities Be Simplified?

In summary, there are three main types of recurrence relations: linear, homogeneous, and non-homogeneous. To identify the type of recurrence relation, you can look at the form and initial conditions. To find the general solution, there are several methods such as substitution, iteration, or the characteristic equation. The particular solution for a non-homogeneous recurrence relation can be found using the method of undetermined coefficients or variation of parameters. Initial conditions are used to find specific values of the sequence. Computer programs such as Mathematica, Matlab, or Maple can be used to solve recurrence relations, but a good understanding of the theory is still important.
  • #1
seeker101
28
0
Any suggestions on how to approach solving:

[tex]\Psi(m,n) \leq \Psi\left(\left \lfloor\frac{m}{2}\right\rfloor,n_1\right) + \Psi\left(\left \lceil\frac{m}{2}\right\rceil,n_2\right) + 16n^*+11m \lceil\text{log }m\rceil
[/tex]

where [tex]n = n_1 + n_2 + n^*[/tex]
 
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  • #2
I would start by making m = 2k. This would give you a more simple recursion, but that inequality and the arbitrary partition of n makes me wonder if it's possible to go beyond a partial computational solution.
 

1. How do I identify the type of recurrence relation?

There are three main types of recurrence relations: linear, homogeneous, and non-homogeneous. Linear recurrence relations have the form a_n = c_1a_n-1 + c_2a_n-2 + ... + c_ka_n-k, where c_1, c_2, ..., c_k are constants. Homogeneous recurrence relations have the form a_n = c_1a_n-1 + c_2a_n-2 + ... + c_ka_n-k, where c_1, c_2, ..., c_k are constants and all the initial conditions are equal to 0. Non-homogeneous recurrence relations have the form a_n = c_1a_n-1 + c_2a_n-2 + ... + c_ka_n-k + f(n), where c_1, c_2, ..., c_k are constants and f(n) is a function of n.

2. How do I find the general solution to a recurrence relation?

To find the general solution to a recurrence relation, you can use several methods such as substitution, iteration, or the characteristic equation. Substitution involves plugging in values for n and solving for a_n until a pattern emerges. Iteration involves using the previous terms in the sequence to find the next term. The characteristic equation method involves finding the roots of the characteristic polynomial and using them to create a general formula for a_n.

3. How do I find the particular solution to a non-homogeneous recurrence relation?

To find the particular solution to a non-homogeneous recurrence relation, you can use the method of undetermined coefficients or the method of variation of parameters. The method of undetermined coefficients involves guessing a particular solution based on the form of f(n) and then solving for the coefficients. The method of variation of parameters involves finding a solution to the corresponding homogeneous recurrence relation and then using a variation of the coefficients to find the particular solution.

4. How do I use initial conditions to solve a recurrence relation?

Initial conditions are used to find the specific values of the sequence. Once you have found the general solution to the recurrence relation, you can plug in the initial conditions to solve for the constants and get a specific formula for the sequence. You can then use this formula to find any term in the sequence.

5. Can I use a computer program to solve a recurrence relation?

Yes, you can use computer programs such as Mathematica, Matlab, or Maple to solve recurrence relations. These programs have built-in functions for finding the general and particular solutions to recurrence relations. However, it is important to have a good understanding of the theory behind solving recurrence relations before relying solely on computer programs.

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