ancient egyptian mathematics - sacredheart.edu · the rhind mathematical papyrus (rmp)/ a.k.a....
TRANSCRIPT
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Ancient Egyptian
Mathematics
Douglas Furman – [email protected] Professor of Mathematics & Mathematics Program Coordinator
SUNY Ulster, Stone Ridge, NY
Fairfield County Math Teachers’ Circle Summer Immersion Workshop
August 7-8, 2017 - Sacred Heart University, Fairfield, CT
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The Rhind Mathematical Papyrus (RMP)/a.k.a. Ahmose (Ahmes) Papyrus
• Who?
• What?
• Where?
• When?
• Why?
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The Rhind Mathematical Papyrus (RMP)/a.k.a. Ahmose (Ahmes) Papyrus
What?
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The Rhind Mathematical Papyrus (RMP)/a.k.a. Ahmose (Ahmes) Papyrus
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The Rhind Mathematical Papyrus (RMP)/a.k.a. Ahmose (Ahmes) Papyrus
• 64 “Problems”
• Various Tables & Calculations
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The Rhind Mathematical Papyrus (RMP)/a.k.a. Ahmose (Ahmes) Papyrus
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The Rhind Mathematical Papyrus (RMP)/a.k.a. Ahmose (Ahmes) Papyrus
Where?
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The Rhind Mathematical Papyrus (RMP)/a.k.a. Ahmose (Ahmes) Papyrus
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The Rhind Mathematical Papyrus (RMP)/a.k.a. Ahmose (Ahmes) Papyrus
When?
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Ancient Egyptian HistoryKingdoms (Dynasties) Approx. Dates
• Early Dynastic (1 – 2) 3100 – 2600
• Old Kingdom (3 – 6) 2600 – 2150
• 1st Intermediate Period (7 – 10) 2150 – 2000
• Middle Kingdom (11 – 13) 2000 – 1650
• 2nd Intermediate Period (14 – 17) 1650 – 1550
• New Kingdom (18 – 20) 1550 – 1075
• 3rd Intermediate Period (21 – 25) 1075 – 675
• Late Period (26 – 31) 675 – 332 BCE
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When was the RMP Written?
• 1999; 1553; Clagett, Ancient Egyptian Science: A Source Book, Volume Three: Ancient Egyptian Mathematics, [16]
• 2007; 2025-1773 (Middle Kingdom); Imhausen, Egyptian Mathematics in Katz’s The Mathematics of Egypt, Mesopotamia, China, India and Islam: A Sourcebook, [12] (Dates from Shaw)
• 2009; c. 1650; Katz, A History of Mathematics: An Introduction, [3]
• 2016; c. 1550; Imhausen, Mathematics in Ancient Egypt: A Contextual History, [66]
• 2017; c. 1550 (2nd Intermediate); British Musuem, http://www.britishmuseum.org/research/collection_online/collection_object_details.aspx?objectId=110036&partId=1
• 2017; 1493-1481 (New Kingdom); Brooklyn Museum, https://www.brooklynmuseum.org/opencollection/objects/118304/Fragments_of_Rhind_Mathematical_Papyrus
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The Rhind Mathematical Papyrus (RMP)/a.k.a. Ahmose (Ahmes) Papyrus
Who?
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Alexander Henry Rhind (1833-1863)
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Title Page
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Title Page
Accurate reckoning for inquiring into things, and the knowledge of all things, mysteries ... all secrets. This book was copied in regnal year 33, month 4 of Akhet [the inundation season], under the majesty of the King of Upper and Lower Egypt, Awserre [A-user-Re], given life, from an ancient copy made in the time of the King of Upper and Lower Egypt Nymatre [Ne-ma’et-Re]. The scribe Ahmose writes this copy.
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Ahmose (Scribe)
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The Rhind Mathematical Papyrus (RMP)/a.k.a. Ahmose (Ahmes) Papyrus
Where?
(again)
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Brooklyn Museum
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Brooklyn Fragments - RMP
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The Rhind Mathematical Papyrus (RMP)/a.k.a. Ahmose (Ahmes) Papyrus
Why?
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Why was Mathematics Needed?
• Collect Taxes
• Surveyors
• Construct Silos
• Maintain Armies
• Building Programs
• Trade
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Tomb of Menna – Chief Scribe (1420-1411)
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The Rhind Mathematical Papyrus (RMP)/a.k.a. Ahmose (Ahmes) Papyrus
A Closer Look…
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A closer look…
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The Rhind Mathematical Papyrus (RMP)/a.k.a. Ahmose (Ahmes) Papyrus
Types of Writing
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Types of Writing• Hieroglyphic (Gk. Sacred Carving)
– Gk. hieros “sacred”, glyphe “carving”
– c. 3000 BCE
– Usually carved in stone
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Types of Writing - Hieroglyphic
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Types of Writing• Hieroglyphic (Gk. Sacred Carving)
– Gk. hieros “sacred”, glyphe “carving”
– c. 3000 BCE
– Usually carved in stone
• Hieratic script
– Gk. hieratikos “priestly”
– c. 3000 BCE
– Ink on papyrus, leather, wood, ostraca
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Types of Writing - Hieratic Script
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Types of Writing• Hieroglyphic (Gk. Sacred Carving)
– Gk. hieros “sacred”, glyphe “carving”
– c. 3000 BCE
– Usually carved in stone
• Hieratic script
– Gk. hieratikos “priestly”
– c. 3000 BCE
– In ink on papyrus, leather, wood, ostraca
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The Rhind Mathematical Papyrus (RMP)/a.k.a. Ahmose (Ahmes) Papyrus
Types of Numerals
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Egyptian Numerals - Hieratic• Hieratic Numerals
– Personalized by scribe
• Chace, RMP
– Prob 41 facsimile [107/46]
• [line 3] 640
• [line 4] 960
– Prob 41 photo [142]
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Hieroglyphic Numerals
1,333,331
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Hieroglyphic Numerals
3,244
21,237
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Egyptian Numerals - Fractions
• Unit fractions 1/n
– 2/5 = 1/3 + 1/15
– One exception 2/3
• Hieroglyphic fractions
– An oval “part” placed over the denominator
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Hieroglyphic Fractions
Author of photograph: Ad Meskens. (Wikipedia)
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Egyptian Numerals - Fractions
• Unit fractions 1/n
– 2/5 = 1/3 + 1/15
– One exception 2/3
• Hieroglyphic fractions
– An oval “part” placed over the denominator
• Hieratic fractions
– A dot placed over the denominator
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Hieratic Fractions
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Egyptian Numerals - Fractions
• Unit fractions 1/n
– 2/5 = 1/3 + 1/15
– One exception 2/3
• Hieroglyphic fractions
– An oval “part” placed over the denominator
• Hieratic fractions
– A dot placed over the denominator
• Special symbols
– 2/3, 1/2, 1/3, 1/4
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Special Fractions
Imhausen, 2016, Mathematics in Ancient Egypt: A Contextual History, p. 53
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Hieratic Fractions – Special Symbols
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Egyptian Numerals - Fractions
• Unit fractions 1/n
– 2/5 = 1/3 + 1/15
– One exception 2/3
• Hieroglyphic fractions
– An oval “part” placed over the denominator
• Hieratic fractions
– A dot placed over the denominator
• Special symbols
– 2/3, 1/2, 1/3, 1/4
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The Rhind Mathematical Papyrus (RMP)/a.k.a. Ahmose (Ahmes) Papyrus
Multiplication
&
Division
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Multiplication
31 times 11
\ 1 31
\ 2 62
4 124
\ 8 248
341
• Pick bigger factor (31) to pair with “1”
• Then keep doubling both columns until a double would exceed the smaller factor (11)
Note: 16 exceeds 11
• Then starting with the biggest power of 2 mark the powers of 2 that add up to the smaller factor
• Add the “doubles” (i.e. the big factors) associated with the marked small factors, this is the product.
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Multiplication – You Try
1 23
\ 2 46
\ 4 92
\ 8 184
322
• Pick bigger factor to pair with “1”
• Then keep doubling both columns until a double would exceed the smaller factor
• Then starting with the biggest power of 2 mark the powers of 2 that add up to the smaller factor
• Add the doubles of the “marked” big factors
23 times 14
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Division
\ 1 81
\ 2 162
4 324
8 648
\ 16 1296
19
• Pick the divisor (81) to pair with “1”
• Then keep doubling both columns until a double would exceed the dividend (1539)
Note: doubling 1296 exceeds 1539
• Then starting with the biggest doubled divisor, add the doubled divisors until they sum to the dividend (1539), marking the corresponding powers of 2
• Add “marked” powers of 2
1539 divided by 81
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Division – You Try
\ 1 53
2 106
\ 4 212
8 424
16 848
\ 32 1696
37
• Pick the divisor to pair with “1”
• Then keep doubling both columns until a double would exceed the dividend
• Then starting with the biggest doubled divisor, add the doubled divisors until they sum to the dividend (1961), marking the corresponding powers of 2
• Add “marked” powers of 2
1961 divided by 53
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The Rhind Mathematical Papyrus (RMP)/a.k.a. Ahmose (Ahmes) Papyrus
Problems from the RMP
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Problems from Original Sources
• Ahmose Papyrus
–2/n Table
–Pr. 3 (6 loaves among 10)
–Pr. 26 (“aha” - false position)
–Pr. 50 (area of a circle)
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The Rhind Mathematical Papyrus (RMP)/a.k.a. Ahmose (Ahmes) Papyrus
2 ÷ n Table
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2 ÷ n Table
23
3
1 1 12 , 8 , 25
2 8 25
We’ll use the following common convention:
Recall 2/3 is the only exception to the use of unit fractions, so we’ll use the common convention of:
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2 ÷ n Table
• 2 divided by 3
• 2 divide by 5
• 2 divided by 7
• 2 divided by 9
3
3 15
4 28
6 18
Do these numbers look familiar?
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Hieratic Fractions
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Title Page
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2 ÷ n Table
• 2 divided by 45 24 360
25 225
27 135
30 90
35 63
36 60
45 45
30 90
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2 ÷ n Table
Note: See b/w handout Table 6.1 (Gillings 1972)
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The Rhind Mathematical Papyrus (RMP)/a.k.a. Ahmose (Ahmes) Papyrus
Problems 1 – 6Dividing n loaves of bread among 10 men
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RMP Problem 3:Divide 6 loaves among 10 men
• Modern
6/10 = 3/5
6 men get 1 piece
4 men get 2 pieces
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RMP Problem 3:Divide 6 loaves among 10 men
• Modern
6/10 = 3/5
• Egyptian
6/10 =
All 10 get the same 2 pieces
2 10
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RMP Problem 3:Divide 6 loaves among 10 men
• Egyptian
6/10 =
The product of the same:
2 10
1 2 10
2 1 5
4 2 3 15
8 4 3 10 30
Total loaves 6, which is correct.
/
/
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The Rhind Mathematical Papyrus (RMP)/a.k.a. Ahmose (Ahmes) Papyrus
‘aha’ Problems
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The Rule of False Position ‘aha’ (quantity) problem – Problem 26
A quantity and its ¼ added together become 15. What is the quantity?
Assume 4
\ 1 4\ ¼ 1Total 5
\ 1 5\ 2 10Total 3
1 32 6
\ 4 12
12¼ 3
Total 15
115
4
Let 4
14 (4) ?
4
4 1 5 Off by a factor of 3.
So scale up value of
by a factor of 3.
4 3
12
x x
x
x
x
x
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False Position – You Try
• A quantity and its 1/6 added together become 56. What is the quantity?
156
6
Let 6
16 (6) ?
6
6 1 7 Off by a factor of 8.
So scale up value of
by a factor of 8.
6 8
48
x x
x
x
x
x
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Area of a CircleProblem 50: Example of a round field of diameter 9 khet. What is its area?
Take away 1/9 of the diameter, namely 1; the remainder is 8. Multiply 8 times 8; it makes 64. Therefore it contains 64 setat of land.
Do it thus:
1 9
1/9 1;
This taken away leaves 8
1 8
2 16
4 32
\ 8 64
Its area is 64 setat
2
2
2
1
9
8
9
64
81
A d d
A d
A d
2
2
2
642
81
644
81
256
81
A r
A r
A r
Thus,
2563.16 an error of approx. 0.6%
81E
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Epilouge
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Moscow Papyrus
• Pushkin State Museum of Fine Arts, Moscow
• 16’ 5” x 3”
• c. 1850 BCE
• Problem 14
– Truncated Prism (Frustum)
– 2 21
3V h a ab b
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Moscow Papyrus – Prob. 14 2 21
3V h a ab b
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THANK YOU
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Bilbiography• Chace, Arnold B. et al. The Rhind Mathematical Papyrus, Reston, VA:
NCTM, 1979 (originally published by MAA, 1927-9).• Clagett, Marshall. Ancient Egyptian Science: A Source Book, Vol. 3:
Ancient Egyptian Mathematics, Philadelphia: American Philosophical Society, 1999
• Gillings, Richard J. “Problems 1 to 6 of the Rhind Mathematical Papyrus.” The Mathematics Teacher, Vol. 55, No. 1 (January 1962), pp. 61-69
• Gillings, Richard J., Mathematics in the Time of the Pharaohs, New York: Dover, 1982 (originally published by MIT Press, 1972).
• Imhausen Annette. Mathematics in Ancient Egypt: A Contextual History, Princeton: Princeton University Press, 2016.
• Imhausen Annette. “Egyptian Mathematics” in Katz, Victor J., ed., The Mathematics of Egypt Mesopotamia, China, India and Islam: A Sourcebook, Princeton: Princeton University Press, 2007, pp. 7-56.
• Katz, Victor J. A History of Mathematics: An Introduction, Boston: Pearson Education, Inc., 3rd ed., 2009.
• Robins, Gay & Shute, Charles. The Rhind Mathematical Papyrus: an ancient Egyptian text, New York: Dover reprint; London: British Museum Publications, 1987.
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Further Reading
• Reimer, David. Count Like an Egyptian. Princeton: Princeton University Press, 2014.
• Joseph, George Gheverghese. The Crest of the Peacock: Non-European Roots of Mathematics, Princeton: Princeton University Press, 3rd ed., 2011.