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'''Golden ratio base''' is a [[Non-integer representation|non-integer positional numeral system]] that uses the [[golden ratio]] (the irrational number (1+{{sqrt|5}})/2&nbsp;≈&nbsp;1.61803399 symbolized by the [[Greek alphabet|Greek letter]] [[phi|φ]]) as its [[base (exponentiation)|base]]. It is sometimes referred to as '''base-φ''', '''golden mean base''', '''phi-base''', or, colloquially, '''phinary'''. Any [[non-negative]] [[real number]] can be represented as a base-φ numeral using only the digits 0 and 1, and avoiding the digit sequence "11"&nbsp;– this is called a ''standard form''. A base-φ numeral that includes the digit sequence "11" can always be rewritten in standard form, using the algebraic properties of the base φ&nbsp;— most notably that φ&nbsp;+&nbsp;1&nbsp;=&nbsp;φ<sup>2</sup>. For instance, 11<sub>φ</sub>&nbsp;= 100<sub>φ</sub>.
 
Despite using an [[irrational number]] base, when using standard form, all non-negative [[integer]]s have a unique representation as a terminating (finite) base-φ expansion. The set of numbers which possess a finite base-φ representation is the [[ring (algebra)|ring]] [[quadratic integer|'''Z'''[{{sfrac|1 + {{sqrt|5}}|2}}]]]; it plays the same role in this numeral systems as [[dyadic rational]]s play in [[binary number]]s, providing a possibility to [[multiplication|multiply]].
 
Other numbers have standard representations in base-φ, with [[rational number]]s having recurring representations.  These representations are unique, except that numbers (mentioned above) with a terminating expansion also have a non-terminating expansion, as they do in [[decimal|base-10]]; for example, [[Proof that 0.999... equals 1|1=0.99999…]].
 
==Examples==
{| class="wikitable"
|-
! Decimal
! Powers of φ
! Base φ
|-
| 1
| φ<sup>0</sup>
| align=right | <tt>1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</tt>
|-
| 2
| φ<sup>1</sup> + φ<sup>−2</sup>
| align=right | <tt>10.01&nbsp;&nbsp;</tt>
|-
| 3
| φ<sup>2</sup> + φ<sup>−2</sup>
| align=right | <tt>100.01&nbsp;&nbsp;</tt>
|-
| 4
| φ<sup>2</sup> + φ<sup>0</sup> + φ<sup>−2</sup>
| align=right | <tt>101.01&nbsp;&nbsp;</tt>
|-
| 5
| φ<sup>3</sup> + φ<sup>−1</sup> + φ<sup>−4</sup>
| align=right | <tt>1000.1001</tt>
|-
| 6
| φ<sup>3</sup> + φ<sup>1</sup> + φ<sup>−4</sup>
| align=right | <tt>1010.0001</tt>
|-
| 7
| φ<sup>4</sup> + φ<sup>−4</sup>
| align=right | <tt>10000.0001</tt>
|-
| 8
| φ<sup>4</sup> + φ<sup>0</sup> + φ<sup>−4</sup>
| align=right | <tt>10001.0001</tt>
|-
| 9
| φ<sup>4</sup> + φ<sup>1</sup> + φ<sup>−2</sup> + φ<sup>−4</sup>
| align=right | <tt>10010.0101</tt>
|-
| 10
| φ<sup>4</sup> + φ<sup>2</sup> + φ<sup>−2</sup> + φ<sup>−4</sup>
| align=right | <tt>10100.0101</tt>
|}
 
==Writing golden ratio base numbers in standard form==
 
211.0<u>1</u><sub>φ</sub> is not a standard base-φ numeral, since it contains a "11" and a "2", which isn't a "0" or "1", and contains a <u>1</u>=-1, which isn't a "0" or "1" either.
 
To "standardize" a numeral, we can use the following substitutions: 011<sub>φ</sub> = 100<sub>φ</sub>, 0200<sub>φ</sub> = 1001<sub>φ</sub> and 0<u>1</u>0<sub>φ</sub> = <u>1</u>01<sub>φ</sub>. We can apply the substitutions in any order we like, as the result is the same. Below, the substitutions applied to the number on the previous line are on the right, the resulting number on the left.
 
  211.0<u>1</u><sub>φ</sub>
  300.0<u>1</u><sub>φ</sub>    011<sub>φ</sub> → 100<sub>φ</sub>
  1101.0<u>1</u><sub>φ</sub>    0200<sub>φ</sub> → 1001<sub>φ</sub>
10001.0<u>1</u><sub>φ</sub>    011<sub>φ</sub> → 100<sub>φ</sub> (again)
10001.<u>1</u>01<sub>φ</sub>    0<u>1</u>0<sub>φ</sub> → <u>1</u>01<sub>φ</sub>
10000.011<sub>φ</sub>    0<u>1</u>0<sub>φ</sub> → <u>1</u>01<sub>φ</sub> (again)
10000.1<sub>φ</sub>      011<sub>φ</sub> → 100<sub>φ</sub> (again)
 
Any [[positive number]] with a non-standard terminating base-φ representation can be [[unique]]ly standardized in this manner. If we get to a point where all digits are "0" or "1", except for the first digit being [[negative number|negative]], then the number is negative.  This can be converted to the negative of a base-φ representation by [[negation (algebra)|negating]] every digit, standardizing the result, and then marking it as negative.  For example, use a [[minus sign]], or some other significance to denote negative numbers. If the arithmetic is being performed on a computer, an [[error message]] may be returned.
 
Note that when adding the digits "9" and "1", the result is a ''single'' digit "(10)", "A" or similar, as we are ''not'' working in decimal.
 
==Representing integers as golden ratio base numbers==
 
We can either consider our integer to be the (only) digit of a nonstandard base-φ numeral, and standardize it, or do the following:
 
1×1 = 1, φ × φ = 1 + φ and 1/φ = −1 + φ. Therefore, we can compute
 
: (''a'' + ''b''φ) + (''c'' + ''d''φ) = ((''a'' + ''c'') + (''b'' + ''d'')φ),
: (''a'' + ''b''φ) − (''c'' + ''d''φ) = ((''a'' − ''c'') + (''b'' − ''d'')φ)
 
and
 
: (''a'' + ''b''φ) × (''c'' + ''d''φ) = ((''ac'' + ''bd'') + (''ad'' + ''bc'' + ''bd'')φ).
 
So, using integer values only, we can add, subtract and multiply numbers of the form (''a'' + ''b''φ), and even represent positive and negative integer [[Exponentiation|powers]] of φ. (Note that φ<sup>−1</sup> = 1/φ.)
 
(''a'' + ''b''φ) &gt; (''c'' + ''d''φ) if and only if 2(''a'' − ''c'') − (''d'' − ''b'') &gt; (''d'' − ''b'') × √5. If one side is negative, the other positive, the comparison is trivial. Otherwise, square both sides, to get an integer comparison, reversing the comparison direction if both sides were negative. On [[square (algebra)|squaring]] both sides, the √5 is replaced with the integer 5.
 
So, using integer values only, we can also compare numbers of the form (''a'' + ''b''φ).
 
# To convert an integer ''x'' to a base-φ number, note that ''x'' = (''x'' + 0φ).
# Subtract the highest power of φ, which is still smaller than the number we have, to get our new number, and record a "1" in the appropriate place in the resulting base-φ number.
# Unless our number is 0, go to step 2.
# Finished.
 
The above procedure will never result in the sequence "11", since 11<sub>φ</sub> = 100<sub>φ</sub>, so getting a "11" would mean we missed a "1" prior to the sequence "11".
 
Start, e. g., with integer=5, with the result so far being ...00000.00000...<sub>φ</sub>
 
Highest power of φ ≤ 5 is φ<sup>3</sup> = 1 + 2φ ≈ 4.236067977
 
Subtracting this from 5, we have 5 − (1 + 2φ) = 4 − 2φ ≈ 0.763932023..., the result so far being 1000.00000...<sub>φ</sub>
 
Highest power of φ ≤ 4 − 2φ ≈ 0.763932023... is φ<sup>−1</sup> = −1 + 1φ ≈ 0.618033989...
 
Subtracting this from 4 − 2φ ≈ 0.763932023..., we have 4 − 2φ − (−1 + 1φ) = 5 − 3φ ≈ 0.145898034..., the result so far being 1000.10000...<sub>φ</sub>
 
Highest power of φ ≤ 5 − 3φ ≈ 0.145898034... is φ<sup>−4</sup> = 5 − 3φ ≈ 0.145898034...
 
Subtracting this from 5 − 3φ ≈ 0.145898034..., we have 5 − 3φ − (5 − 3φ) = 0 + 0φ = 0, with the final result being '''1000.1001'''<sub>φ</sub>.
 
===Non-uniqueness===
 
Just as with any base-n system, numbers with a terminating representation have an alternative recurring representation. In base-10, this relies on the observation that [[0.999...|0.999...=1]].  In base-φ, the numeral 0.1010101... can be seen to be equal to 1 in several ways:
 
*Conversion to nonstandard form: 1  = 0.11<sub>φ</sub> = 0.1011<sub>φ</sub> = 0.101011<sub>φ</sub> = ... = 0.10101010....<sub>φ</sub>
*[[Geometric series]]: 1.0101010...<sub>φ</sub> is equal to
:: <math>\sum_{k=0}^\infty \varphi^{-2k}=\frac{1}{1-\varphi^{-2}} = \varphi</math>
*Difference between "shifts": φ<sup>2</sup> x − x = 10.101010...<sub>φ</sub> − 0.101010...<sub>φ</sub> = 10<sub>φ</sub> = φ so that x = φ/(φ<sup>2</sup>&nbsp;−&nbsp;1) = 1
 
This non-uniqueness is a feature of the numeration system, since both 1.0000 and 0.101010... are in standard form.
 
In general, the final 1 of any number in base-φ can be replaced with a recurring 01 without changing the value of that number.
 
==Representing rational numbers as golden ratio base numbers==
 
Every non-negative rational number can be represented as a recurring base-φ expansion, as can any non-negative element of the [[field (mathematics)|field]] '''Q'''[√5] = '''Q''' + √5'''Q''', the field generated by the [[rational number]]s and [[square root of 5|√5]]. Conversely any recurring (or terminating) base-φ expansion is a non-negative element of '''Q'''[√5].  Some examples (with spaces added for emphasis):
 
*1/2 ≈ 0.010 010 010 010 ... <sub>φ</sub>
*1/3 ≈ 0.00101000 00101000 00101000... <sub>φ</sub>
*√5 = 10.1<sub>φ</sub>
*2+(1/13)√5 ≈ 10.010 1000100010101000100010000000 1000100010101000100010000000 1000100010101000100010000000 ...<sub>φ</sub>
 
The justification that a rational gives a recurring expansion is analogous to the equivalent proof for a base-n numeration system (n=2,3,4,...).  Essentially in base-φ [[long division]] there are only a finite number of possible remainders, and so once there must be a recurring pattern. For example with 1/2 = 1/10.01<sub>φ</sub> = 100<sub>φ</sub>/1001<sub>φ</sub> long division looks like this (note that base-φ subtraction may be hard to follow at first):
 
                .0 1 0 0 1
        ________________________
1 0 0 1 ) 1 0 0.0 0 0 0 0 0 0 0
            1 0 0 1                        trade: 10000 = 1100 = 1011
            -------                            so 10000 − 1001 = 1011 − 1001 = 10
                1 0 0 0 0
                  1 0 0 1
                  -------
                      etc.
 
The converse is also true, in that a number with a recurring base-φ; representation is an element of the field '''Q'''[{{sqrt|5}}].  This follows from the observation that a recurring representation with period k involves a [[geometric series]] with ratio φ<sup>−k</sup>, which will sum to an element of '''Q'''[{{sqrt|5}}].
 
==Representing irrational numbers of note as golden ratio base numbers==
The base-φ representations of some interesting numbers:
<!-- unlike the previous rational numbers where spaces actually indicate something meaningful, the spaces I stuck in these irrational numbers every 4 bits are meaningless. Feel free to remove/add spaces if it helps. -->
 
* [[Pi|π]] ≈ 100.0100 1010 1001 0001 0101 0100 0001 0100 ...<sub>φ</sub> {{OEIS|A102243}}
* ''[[e (mathematical constant)|e]]'' ≈ 100.0000 1000 0100 1000 0000 0100 ...<sub>φ</sub> {{OEIS|A105165}}
* [[Square root of 2|{{sqrt|2}}]] ≈ 1.0100 0001 0100 1010 0100 0000 0101 0000 0000 0101 ...<sub>φ</sub>
* [[golden ratio|φ]] = (1+{{sqrt|5}})/2 = 10<sub>φ</sub>
* {{sqrt|5}} = 10.1<sub>φ</sub>
 
==Addition, subtraction, and multiplication==
It is possible to adapt all the standard algorithms of base-10 arithmetic to base-φ arithmetic.  There are two approaches to this:
 
===Calculate, then convert to standard form===
For [[addition]] of two base-φ numbers, add each pair of digits, without carry, and then convert the numeral to standard form. For [[subtraction]], subtract each pair of digits without borrow (borrow is a negative amount of carry), and then convert the numeral to standard form. For [[multiplication]], multiply in the typical base-10 manner, without carry, then convert the numeral to standard form.
 
For example
*2 + 3 = 10.01 + 100.01 = 110.02 = 110.1001 = 1000.1001
*2 × 3 =  10.01 × 100.01 = 1000.1 + 1.0001 = 1001.1001 = 1010.0001
*7 − 2 = 10000.0001 − 10.01 = 100<u>1</u>0.0<u>1</u>01 = 11<u>1</u>0.0<u>1</u>01 = 1001.0<u>1</u>01 = 1000.1001
 
===Avoid digits other than 0 and 1===
A more "native" approach is to avoid having to add digits 1+1 or to subtract 0-1.  This is done by reorganising the operands into nonstandard form so that these combinations do not occur.  For example
* 2 + 3 = 10.01 + 100.01 =  10.01 + 100.0011 = 110.0111 = 1000.1001
* 7 − 2 = 10000.0001 − 10.01 = 1100.0001 − 10.01 = 1011.0001 − 10.01 = 1010.1101 − 10.01 = 1000.1001
The subtraction seen here uses a modified form of the standard "trading" algorithm for subtraction.
 
==Division==
No non-integer [[rational number]] can be represented as a [[finite set|finite]] base-φ number. In other words, all finitely representable base-φ numbers are either integers or (more likely) an irrational in a [[quadratic field]] '''Q'''[{{sqrt|5}}].  Due to long division having only a finite number of possible remainders, a division of two integers (or other numbers with finite base-φ representation) will have a recurring expansion, as demonstrated above.
 
==Relationship with Fibonacci coding==
{{main|Fibonacci coding}}
 
[[Fibonacci coding]] is a closely related numeration system used for integers.  In this system, only digits 0 and 1 are used and the place values of the digits are the [[Fibonacci number]]s.  As with base-φ, the digit sequence "11" is avoided by rearranging to a standard form, using the Fibonacci [[recurrence relation]] F<sub>k+1</sub> = F<sub>k</sub> + F<sub>k−1</sub>.  For example
::30 = 1×21 + 0×13 + 1×8 + 0×5 + 0×3 + 0×2 + 1×1 + 0×1 = 10100010<sub>fib</sub>.
 
==See also==
* [[Beta encoder]]&nbsp;– Originally used golden ratio base
* [[Ostrowski numeration]]
 
==External links==
* [http://www.mcs.surrey.ac.uk/Personal/R.Knott/Fibonacci/phigits.html Using Powers of Phi to represent Integers (Base Phi)]
 
==References==
* {{cite journal|doi=10.2307/3029218|last=Bergman|first=George|title=A Number System with an Irrational Base|journal=Mathematics Magazine|volume=31|issue=2|pages=98–110|year=1957|jstor=3029218}}
* {{cite journal
|first1=L. C.
|last1=Eggan
|first2=C. L.
|last2=vanden Eynden
|jstor=2314786
|journal=Am. Math. Monthly
|year=1966
|number=73
|pages=576–582
|title=Decimal expansions to nonintegral bases
}}
*{{cite journal|last=Plojhar|first=Jozef|title=The Good natured Rabbit breeder|journal=Manifold|volume=11|year=1971|pages=26–30}}
<!-- ''To do: is there any official name for normalizing?''
  ... not that I know of, but "standard form" is not too bad, so I have incorporated this -->
 
[[Category:Non-standard positional numeral systems]]
[[Category:Golden ratio]]

Revision as of 23:17, 9 February 2014

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