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lfdahl
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Let the sequence ${x_n}$ be defined by $x_0=2$ and $x_n=\frac{x_{n-1}}{2}+\frac{1}{x_{n-1}}$ for $n \ge 1$.
Find the limit.
Find the limit.
lfdahl said:Let the sequence ${x_n}$ be defined by $x_0=2$ and $x_n=\frac{x_{n-1}}{2}+\frac{1}{x_{n-1}}$ for $n \ge 1$.
Find the limit.
lfdahl said:Let the sequence ${x_n}$ be defined by $x_0=2$ and $x_n=\frac{x_{n-1}}{2}+\frac{1}{x_{n-1}}$ for $n \ge 1$.
Find the limit.
I like Serena said:I recognize this one. ;)
Let $f(x)=x^2-2$.
Then the root is approximated using the Newton-Raphson method with:
$$x_n = x_{n-1} - \frac{f(x_{n-1})}{f'(x_{n-1})}
= x_{n-1} - \frac{x_{n-1}^2-2}{2x_{n-1}}
= \frac{x_{n-1}}{2}+\frac{1}{x_{n-1}}$$
In other words, the limit is $\sqrt 2$.
A limit of a sequence is the value that the terms of a sequence approach as the index approaches infinity. It can also be thought of as the ultimate behavior or trend of the sequence.
To find the limit of a sequence, you need to observe the pattern of the terms and determine if they are approaching a specific value or if they are oscillating between two values. You can also use mathematical techniques such as the squeeze theorem or the ratio test to find the limit.
A finite limit of a sequence means that the terms of the sequence are approaching a specific value, while an infinite limit means that the terms are growing without bound or oscillating between positive and negative infinity.
No, a sequence can only have one limit. If a sequence has multiple limits, it is not a valid sequence.
Finding the limit of a sequence is important in understanding the behavior and trends of a sequence. It also helps in determining the convergence or divergence of a series, which has applications in various fields of mathematics and science. Additionally, finding the limit of a sequence can help in solving real-world problems involving continuous processes.