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Oct 18, 2018 · Definition: Infinite Sequence. An infinite sequence \(\{a_n\}\) is an ordered list of numbers of the form \(a_1,\,a_2,\,…,\,a_n,\,….\) The subscript \(n\) is called the index variable of the sequence. Each number \(a_n\) is a term of the sequence.
- Exercises for Sequences
For the sequences in exercises 44 and 45, plot the first 25...
- 9.2: Infinite Series
In this section we define an infinite series and show how...
- 8.2: Infinite Series
The sum ∞ ∑ n = 1an is an infinite series (or, simply...
- Exercises for Sequences
- Infinite Or Finite
- In Order
- Like A Set
- As A Formula
- Many Rules
- Notation
- Arithmetic Sequences
- Geometric Sequences
- Triangular Numbers
- Fibonacci Sequence
When the sequence goes on forever it is called an infinite sequence, otherwise it is a finite sequence
When we say the terms are "in order", we are free to define what order that is! They could go forwards, backwards ... or they could alternate ... or any type of order we want!
A Sequence is like a Set, except: 1. the terms are in order(with Sets the order does not matter) 2. the same value can appear many times (only once in Sets)
Saying "starts at 3 and jumps 2 every time" is fine, but it doesn't help us calculate the: 1. 10thterm, 2. 100thterm, or 3. nth term, where ncould be any term number we want.
But mathematics is so powerful we can find more than one Rulethat works for any sequence. So it is best to say "A Rule" rather than "The Rule" (unless we know it is the right Rule).
To make it easier to use rules, we often use this special style: So a rule for {3, 5, 7, 9, ...}can be written as an equation like this: xn= 2n+1 And to calculate the 10th term we can write: x10 = 2n+1 = 2×10+1 = 21 Can you calculate x50(the 50th term) doing this? Here is another example:
In an Arithmetic Sequence the difference between one term and the next is a constant. In other words, we just add some value each time ... on to infinity. In Generalwe can write an arithmetic sequence like this: {a, a+d, a+2d, a+3d, ... } where: 1. ais the first term, and 2. d is the difference between the terms (called the "common difference") And...
In a Geometric Sequence each term is found by multiplying the previous term by a constant. In Generalwe can write a geometric sequence like this: {a, ar, ar2, ar3, ... } where: 1. ais the first term, and 2. r is the factor between the terms (called the "common ratio") And the rule is: xn = ar(n-1) (We use "n-1" because ar0is the 1st term)
The Triangular Number Sequenceis generated from a pattern of dots which form a triangle: By adding another row of dots and counting all the dots we can find the next number of the sequence.
The next number is found by adding the two numbers before ittogether: 1. The 2 is found by adding the two numbers before it (1+1) 2. The 21 is found by adding the two numbers before it (8+13) 3. etc... Rule is xn = xn-1 + xn-2 That rule is interesting because it depends on the values of the previous two terms. The Fibonacci Sequence is numbered fro...
Sequences can be finite, as in this example, or infinite, such as the sequence of all even positive integers [latex](2, 4, 6, \cdots)[/latex]. Finite sequences are sometimes known as strings or words, and infinite sequences as streams.
Normally, the term infinite sequence refers to a sequence that is infinite in one direction, and finite in the other—the sequence has a first element, but no final element. Such a sequence is called a singly infinite sequence or a one-sided infinite sequence when disambiguation is necessary.
Oct 18, 2018 · In this section we define an infinite series and show how series are related to sequences. We also define what it means for a series to converge or diverge. We introduce one of the most important types of series: the geometric series.
Infinite Series. The sum of infinite terms that follow a rule. When we have an infinite sequence of values: 12 , 14 , 18 , 116 , ... which follow a rule (in this case each term is half the previous one), and we add them all up: 12 + 14 + 18 + 116 + ... = S. we get an infinite series.
Dec 29, 2020 · The sum ∞ ∑ n = 1an is an infinite series (or, simply series). Let Sn = n ∑ i = 1ai; the sequence {Sn} is the sequence of nth partial sums of {an}. If the sequence {Sn} diverges, the series ∞ ∑ n = 1an diverges. Using our new terminology, we can state that the series ∞ ∑ n = 11 / 2n converges, and ∞ ∑ n = 11 / 2n = 1.
