Math Problem Statement

a1=0 an=1, an-1 +2n-2

Solution

To solve this recurrence relation for the sequence {an}\{a_n\}, we have:

  1. Initial condition: a1=0a_1 = 0

  2. Recursive formula: an=1+an1+2n2a_n = 1 + a_{n-1} + 2n - 2

This means each term is defined in terms of the previous term with an additional value that includes both a constant and a term that depends on nn.

Let’s calculate the first few terms to see if we can identify a pattern:

  • For n=1n = 1: a1=0(initial condition)a_1 = 0 \quad \text{(initial condition)}

  • For n=2n = 2: a2=1+a1+222=1+0+42=3a_2 = 1 + a_1 + 2 \cdot 2 - 2 = 1 + 0 + 4 - 2 = 3

  • For n=3n = 3: a3=1+a2+232=1+3+62=8a_3 = 1 + a_2 + 2 \cdot 3 - 2 = 1 + 3 + 6 - 2 = 8

  • For n=4n = 4: a4=1+a3+242=1+8+82=15a_4 = 1 + a_3 + 2 \cdot 4 - 2 = 1 + 8 + 8 - 2 = 15

It appears the terms are growing quadratically. Solving the recurrence more formally would involve finding a closed-form expression for ana_n, but from these calculations, we see that each term builds on the previous by adding a quantity that increases linearly with nn.


Would you like further analysis on finding a closed-form expression or details on the derivation of a solution?


Questions to explore:

  1. How does one solve a recurrence relation using characteristic equations?
  2. Can we apply the method of iteration to guess a pattern for ana_n?
  3. What is the relationship between recurrence relations and sequences in general?
  4. How might we confirm the closed-form formula for a recurrence sequence?
  5. How does changing the initial condition affect the solution?

Tip: When working with recurrence relations, computing the first few terms often helps in identifying patterns, which is a good step towards finding a solution.

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Math Problem Analysis

Mathematical Concepts

Recurrence Relations
Sequences and Series
Linear Recurrence with Variable Coefficients

Formulas

an = 1 + an-1 + 2n - 2

Theorems

Recurrence Relation Properties
Method of Iteration for Sequences

Suitable Grade Level

Grades 11-12