Fibonacci sequence - calculating values

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Discussion Overview

The discussion centers around the calculation of Fibonacci sequences, exploring different methods and expressions used to derive the terms of the sequence. Participants share their understanding and seek clarification on both the recursive and closed-form approaches to Fibonacci numbers.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Homework-related

Main Points Raised

  • One participant expresses confusion about calculating Fibonacci sequences and requests clarification.
  • Another participant explains the recursive formula F_{n+1} = F_{n} + F_{n-1} and demonstrates how to generate the sequence step by step.
  • A different participant mentions being taught to use the expression involving the square root of 5 and the golden ratio, but does not understand its significance.
  • One participant corrects the misunderstanding about the expression, clarifying that it refers to the golden ratio, φ, which is relevant in the closed-form expression for Fibonacci numbers.
  • Another participant suggests using Wikipedia as a resource for further understanding the significance of √5 in relation to Fibonacci numbers.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the understanding of the golden ratio's role in calculating Fibonacci numbers, and there is a mix of clarity and confusion regarding different methods of calculation.

Contextual Notes

Some participants express uncertainty about the mathematical expressions and their applications, indicating a need for further clarification on the closed-form solution and its derivation.

Who May Find This Useful

Individuals interested in mathematical sequences, particularly those studying or teaching Fibonacci numbers, as well as those seeking clarification on recursive versus closed-form methods of calculation.

Mokae
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Hello,
a couple of days back I have learn about calculating fibonacci sequences but still I don;t quite uderstand the way it is calcilated, could you please give me some thoughts about it?

Thank you
 
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it's easy
[tex]F_{n+1} = F_{n} + F_{n-1}[/tex]

So the next number in the series, [tex]F_{n+1}[/tex], is the sum of the previous two numbers

We start with 1. 1 plus the previous number, 0, is 1. 1+0=1. Now our series is 1,1
Now we take 1 and the number before it, 1 and add. 1+1=2. Now our series is 1,1,2
Now we take 2 and the previous number, 1, and add. 2+1=3. Now our series is 1,1,2,3.
Now take 3 and add the previous number, 2, and add. 3+2=5. 1,1,2,3,5
5+3=8, 8+5=13, 13+8=21, ... Fib Series looks like 1,1,2,3,5,8,13,21,...

got it?
 
Last edited:
Thank you,
my profesor teach me to use sqrt of 2 plus 5 all divide 2
to calculate and i don't understand why. I am too scare to ask him again
 
No, your teacher told you to use [itex]\frac{\sqrt{5}+1}{2}[/itex] to calculate Fibonnaci terms. That constant I just said is the golden ratio, commonly denoted by the greek letter "phi", [itex]\phi[/itex]. It is used in the closed form expression of the terms in the sequence. Don't be asked, you should ask him again.
 

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