View source for Moscow Mathematical Papyrus

{{Short description|Ancient Egyptian mathematical manuscript}}
{{Infobox manuscript
| name                  = Moscow Mathematical Papyrus
| location              = [[Pushkin State Museum of Fine Arts]] in Moscow
<!----------Image---------->
| image                 = File:Moskou-papyrus.jpg
| width                 = 300px
| caption               = 14th problem of the Moscow Mathematical Papyrus (V. Struve, 1930)
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| Date                  = [[Thirteenth dynasty of Egypt|13th dynasty]], [[Second Intermediate Period of Egypt]]
| Place of origin       = [[Thebes, Egypt|Thebes]]
| Language(s)           = [[Hieratic]]
| Scribe(s)             =
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| Material              =
| Size                  = Length: {{convert|18|ft|m|disp=flip}}<br>Width: {{convert|1.5|to|3|in|cm|disp=flip|abbr=on}}
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}}

The '''Moscow Mathematical Papyrus''', also named the '''Golenishchev Mathematical Papyrus''' after its first non-Egyptian owner, [[Egyptologist]] [[Vladimir Golenishchev]], is an [[ancient Egyptian mathematics|ancient Egyptian mathematical]] [[papyrus]] containing several problems in [[arithmetic]], [[geometry]], and [[algebra]]. Golenishchev bought the papyrus in 1892 or 1893 in [[Thebes, Egypt|Thebes]]. It later entered the collection of the [[Pushkin State Museum of Fine Arts]] in [[Moscow]], where it remains today.

Based on the [[palaeography]] and orthography of the [[hieratic]] text, the text was most likely written down in the [[Thirteenth Dynasty of Egypt|13th Dynasty]] and based on older material probably dating to the [[Twelfth Dynasty of Egypt]], roughly 1850 BC.<ref name="Clagett">Clagett, Marshall. 1999. Ancient Egyptian Science: A Source Book. Volume 3: Ancient Egyptian Mathematics. Memoirs of the American Philosophical Society 232. Philadelphia: American Philosophical Society. {{ISBN|0-87169-232-5}}</ref> Approximately 5.5&nbsp;m (18&nbsp;ft) long and varying between {{convert|1.5|and|3|in|cm|disp=flip|abbr=on}} wide, its format was divided by the [[Soviet Union|Soviet]] [[oriental studies|Orientalist]] [[Vasily Vasilievich Struve]]<ref>[http://www.encspb.ru/en/article.php?kod=2804014273 Struve V.V., (1889–1965), orientalist :: ENCYCLOPAEDIA OF SAINT PETERSBURG<!-- Bot generated title -->]</ref> in 1930<ref>Struve, Vasilij Vasil'evič, and [[Boris Turaev]]. 1930. ''Mathematischer Papyrus des Staatlichen Museums der Schönen Künste in Moskau''. Quellen und Studien zur Geschichte der Mathematik; Abteilung A: Quellen 1. Berlin: J. Springer</ref> into 25 problems with solutions.

It is a well-known mathematical papyrus, usually referenced together with the [[Rhind Mathematical Papyrus]]. The Moscow Mathematical Papyrus is older than the Rhind Mathematical Papyrus, while the latter is the larger of the two.<ref>{{GSEn|086742|Папирусы математические}}</ref>

==Exercises contained in the Moscow Papyrus==
The problems in the Moscow Papyrus follow no particular order, and the solutions of the problems provide much less detail than those in the [[Rhind Mathematical Papyrus]]. The papyrus is well known for some of its geometry problems. Problems 10 and 14 compute a surface area and the volume of a [[frustum]] respectively. The remaining problems are more common in nature.<ref name="Clagett"/>

===Ship's part problems===
Problems 2 and 3 are ship's part problems. One of the problems calculates the length of a ship's rudder and the other computes the length of a ship's mast given that it is 1/3 + 1/5 of the length of a cedar log originally 30 [[cubit]]s long.<ref name="Clagett"/>

===Aha problems===
{{Hiero|1=ꜥḥꜥ (aha)|2=<hiero>P6-a:M35</hiero>|align=left|era=nk}}
Aha problems involve finding unknown quantities (referred to as ''aha'', "stack") if the sum of the quantity and part(s) of it are given. The [[Rhind Mathematical Papyrus]] also contains four of these types of problems. Problems 1, 19, and 25 of the Moscow Papyrus are Aha problems. For instance, problem 19 asks one to calculate a quantity taken {{frac|1|1|2}} times and added to 4 to make 10.<ref name="Clagett"/> In other words, in modern mathematical notation one is asked to solve <math>\frac{3}{2}x + 4 = 10</math>.
{{clear}}

===Pefsu problems===
Most of the problems are pefsu problems (see: [[Egyptian algebra]]): 10 of the 25 problems. A pefsu measures the strength of the beer made from a [[hekat]] of grain 
: <math> \mbox{pefsu} = \frac{\mbox{number loaves of bread (or jugs of beer)}}{\mbox{number of heqats of grain}}</math>

A higher pefsu number means weaker bread or beer. The pefsu number is mentioned in many offering lists. For example, problem 8 translates as:
: (1) Example of calculating 100 loaves of bread of pefsu 20
: (2) If someone says to you: "You have 100 loaves of bread of pefsu 20
: (3) to be exchanged for beer of pefsu 4
: (4) like 1/2  1/4  malt-date beer"
: (5) First calculate the grain required for the 100 loaves of the bread of pefsu 20
: (6) The result is 5 heqat. Then reckon what you need for a des-jug of beer like the beer called 1/2  1/4  malt-date beer
: (7) The result is 1/2  of the heqat measure needed for des-jug of beer made from Upper-Egyptian grain.
: (8) Calculate 1/2  of 5 heqat, the result will be 2 1/2
: (9) Take this 2 1/2  four times
: (10) The result is 10. Then you say to him:
: (11) "Behold! The beer quantity is found to be correct."<ref name="Clagett"/>

===Baku problems===
Problems 11 and 23 are Baku problems. These calculate the output of workers. Problem 11 asks if someone brings in 100 logs measuring 5 by 5, then how many logs measuring 4 by 4 does this correspond to? Problem 23 finds the output of a shoemaker given that he has to cut and decorate sandals.<ref name="Clagett"/>

===Geometry problems===
Seven of the twenty-five problems are geometry problems and range from computing areas of triangles, to finding the surface area of a hemisphere (problem 10) and finding the volume of a [[frustum]] (a truncated pyramid).<ref name="Clagett"/>

==Two geometry problems==
===Problem 10===
The tenth problem of the Moscow Mathematical Papyrus asks for a calculation of the surface area of a [[Sphere|hemisphere]] (Struve, Gillings) or possibly the area of a semi-cylinder (Peet).  Below we assume that the problem refers to the area of a hemisphere.

The text of problem 10 runs like this: "Example of calculating a basket. You are given a basket with a mouth of 4 1/2. What is its surface? Take 1/9 of 9 (since) the basket is half an egg-shell. You get 1. Calculate the remainder which is 8. Calculate 1/9 of 8. You get 2/3 + 1/6 + 1/18. Find the remainder of this 8 after subtracting 2/3 + 1/6 + 1/18. You get 7 + 1/9. Multiply 7 + 1/9 by 4 + 1/2. You get 32. Behold this is its area. You have found it correctly."<ref name="Clagett"/><ref>Williams, Scott W. [http://www.math.buffalo.edu/mad/Ancient-Africa/mad_ancient_egypt_geometry.html#moscow10 Egyptian Mathematical Papyri]</ref>

The solution amounts to computing the area as 
: <math> \text{Area} = (((2 \times \text{diameter}) \times \frac{8}{9}) \times \frac{8}{9}) \times \text{diameter} = \frac{128}{81} (\text{diameter})^2</math>

The formula calculates for the area of a hemisphere, where the scribe of the Moscow Papyrus used  <math> \frac{256}{81} \approx 3.16049</math> to [[Approximations of π|approximate π]].

===Problem 14: Volume of frustum of square pyramid===
[[Image:Pyramide-tronquée-papyrus-Moscou 14.jpg|thumb|left]]

The fourteenth problem of the Moscow Mathematical calculates the volume of a [[frustum]].

Problem 14 states that a pyramid has been truncated in such a way that the top area is a square of length 2 units, the bottom a square of length 4 units, and the height 6 units, as shown. The volume is found to be 56 cubic units, which is correct.<ref name="Clagett"/>

{{Quote box|
The text of the example runs like this: "If you are told: a truncated pyramid of 6 for the vertical height by 4 on the base by 2 on the top: You are to square the 4; result 16. You are to double 4; result 8. You are to square this 2; result 4. You are to add the 16 and the 8 and the 4; result 28. You are to take 1/3 of 6; result 2. You are to take 28 twice; result 56.  See, it is of 56. You will find [it] right" <ref>as given in Gunn & Peet, ''Journal of Egyptian Archaeology,'' 1929, 15: 176. See also, Van der Waerden, 1961, Plate 5</ref>}}

The solution to the problem indicates that the Egyptians knew the correct formula for obtaining the [[volume]] of a [[frustum|truncated pyramid]]:
:<math>V = \frac{1}{3} h(a^2 + a b +b^2)</math>

where ''a'' and ''b'' are the base and top side lengths of the truncated pyramid and ''h'' is the height. Researchers have speculated how the Egyptians might have arrived at the formula for the volume of a [[frustum]] but the derivation of this formula is not given in the papyrus.<ref>{{citation
 | last = Gillings | first = R. J.
 | issue = 8
 | journal = The Mathematics Teacher
 | jstor = 27957144
 | pages = 552–555
 | quote = While it has been generally accepted that the Egyptians were well acquainted with the formula for the volume of the complete square pyramid, it has not been easy to establish how they were able to deduce the formula for the truncated pyramid, with the mathematics at their disposal, in its most elegant and far from obvious form
 | title = The volume of a truncated pyramid in ancient Egyptian papyri
 | volume = 57
 | year = 1964| doi = 10.5951/MT.57.8.0552
 }}.</ref>

==Summary==
Richard J. Gillings gave a cursory summary of the Papyrus' contents.<ref name="Gillings">{{cite book |last=Gillings |first=Richard J. |title=Mathematics in the Time of the Pharaohs |publisher=[[Dover Publications|Dover]] |isbn=9780486243153 |pages=246–247}}</ref>  Numbers with overlines denote the [[unit fraction]] having that number as [[Overline#Reciprocal|denominator]], e.g. <math>\bar{4} = \frac{1}{4}</math>; unit fractions were common objects of study in ancient Egyptian mathematics.

{| class="wikitable"
|+ The contents of The Moscow Mathematical Papyrus{{efn|This table is a verbatim reproduction of Gillings, ''Mathematics in the Time of the Pharaohs'', pp.&nbsp;246–247. Only references to other chapters are omitted. The descriptions of problems 5, 8–9, 13, 15, 20–22 and 24 concluded with "See Chapter&nbsp;12." for information on Pesu problems, the description of problem 19 concluded with "See Chapter 14." for information on linear and quadratic equations, and the descriptions of problems 10 and 14 concluded with "See Chapter 18." for information on surface areas of semicylinders or hemispheres.}}
! No.
! Detail
|-
| 1
| Damaged and unreadable.
|-
| 2
| Damaged and unreadable.
|-
| 3
| A cedar mast. <math>\bar{3} \; \bar{5}</math> of <math>30 = 16</math>. Unclear.
|-
| 4
| Area of a triangle. <math>\bar{2}</math> of <math>4 \times 10 = 20</math>.
|-
| 5
| Pesus of loaves and bread. Same as No. 8.
|-
| 6
| Rectangle, area <math>= 12, b = \bar{2} \; \bar{4}l</math>. Find <math>l</math> and <math>b</math>.
|-
| 7
| Triangle, area <math>= 20, h = 2 \; \bar{2}b</math>. Find <math>h</math> and <math>b</math>.
|-
| 8
| Pesus of loaves and bread.
|-
| 9
| Pesus of loaves and bread.
|-
| 10
| Area of curved surface of a hemisphere (or cylinder).
|-
| 11
| Loaves and basket. Unclear.
|-
| 12
| Pesu of beer. Unclear.
|-
| 13
| Pesus of loaves and beer. Same as No. 9.
|-
| 14
| Volume of a truncated pyramid. <math>V = (h/3) (a^2 + ab + b^2)</math>.
|-
| 15
| Pesu of beer.
|-
| 16
| Pesu of beer. Similar to No. 15.
|-
| 17
| Triangle, area <math>= 20, b = (\bar{3} \; \bar{15})h</math>. Find <math>h</math> and <math>b</math>.
|-
| 18
| Measuring cloth in cubits and palms. Unclear.
|-
| 19
| Solve the equation <math>1 \; \bar{2}x + 4 = 10</math>. Clear.
|-
| 20
| Pesu of 1000 loaves. Horus-eye fractions.
|-
| 21
| Mixing of sacrificial bread.
|-
| 22
| Pesus of loaves and beer. Exchange.
|-
| 23
| Computing the work of a cobbler. Unclear. Peet says very difficult.
|-
| 24
| Exchange of loaves and beer.
|-
| 25
| Solve the equation <math>2x + x = 9</math>. Elementary and clear.
|}

==Other papyri==
Other mathematical texts from Ancient Egypt include:
*[[Berlin Papyrus 6619]]
*[[Egyptian Mathematical Leather Roll]]
*[[Lahun Mathematical Papyri]]
*[[Rhind Mathematical Papyrus]]

General papyri:
*[[Papyrus Harris I]]
*[[Rollin Papyrus]]

For the 2/n tables see:
*[[RMP 2/n table]]

==See also==

{{wikisourcelang||Moscow Mathematical Papyrus}}

* [[List of ancient Egyptian papyri]]

==Notes==
{{notelist}}

==References==
<references/>

===Full text of the Moscow Mathematical Papyrus===
* Struve, Vasilij Vasil'evič, and [[Boris Turaev]]. 1930. ''Mathematischer Papyrus des Staatlichen Museums der Schönen Künste in Moskau''. Quellen und Studien zur Geschichte der Mathematik; Abteilung A: Quellen 1. Berlin: J. Springer

===Other references===
* Allen, Don.  April 2001.  [http://www.math.tamu.edu/~don.allen/history/egypt/node4.html ''The Moscow Papyrus''] and [http://www.math.tamu.edu/~don.allen/history/egypt/node5.html ''Summary of Egyptian Mathematics''].
* [[Annette Imhausen|Imhausen, A.]], Ägyptische Algorithmen. Eine Untersuchung zu den mittelägyptischen mathematischen Aufgabentexten, Wiesbaden 2003.
* Mathpages.com.  [http://www.mathpages.com/home/kmath189/kmath189.htm ''The Prismoidal Formula''].
* O'Connor and Robertson, 2000. [http://www-history.mcs.st-andrews.ac.uk/history/HistTopics/Egyptian_papyri.html ''Mathematics in Egyptian Papyri''].
* Truman State University, Math and Computer Science Division.  '''Mathematics and the Liberal Arts:''' [https://web.archive.org/web/20130218031510/http://math.truman.edu/~thammond/history/AncientEgypt.html ''Ancient Egypt''] and [https://web.archive.org/web/20130218031843/http://math.truman.edu/~thammond/history/MoscowPapyrus.html ''The Moscow Mathematical Papyrus''].
* Williams, Scott W. [http://www.math.buffalo.edu/mad/index.html ''Mathematicians of the African Diaspora''], containing a page on [http://www.math.buffalo.edu/mad/Ancient-Africa/mad_ancient_egyptpapyrus.html ''Egyptian Mathematics Papyri''].
* Zahrt, Kim R. W. [http://www.iusb.edu/~journal/static/volumes/2000/zahrt.html ''Thoughts on Ancient Egyptian Mathematics''] {{Webarchive|url=https://web.archive.org/web/20110927141339/http://www.iusb.edu/~journal/static/volumes/2000/zahrt.html |date=2011-09-27 }}.

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[[Category:Egyptian fractions]]
[[Category:Papyri from ancient Egypt]]
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[[Category:19th century BC in Egypt]]
[[Category:Mathematics literature]]
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[[Category:2nd-millennium BC manuscripts]]