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31.12.2018 · AE481231
Order of the day
Repetitio :: Antiquity
Narratio :: L'histoire de fille mecanique
Questio :: What is a digit ?
Lectio :: Dark ages
al-Khwarizmi
Fibonacci
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31.12.1379 · AE-5911231
Etymology of the word "digit"
digit (n.)
in English since late 14c., "numeral below 10," from Latin digitus (french: "doigt") "finger or toe" (also with secondary meanings relating to counting and n...
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31.12.2018 · AE481231
Mariam-Webster dict. definition of a "digit"
any of the Arabic numerals 1 to 9 and usually the symbol 0
one of the elements that combine to form numbers in a system other than the decimal system
di...
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31.12.2018 · AE481231
Our definition "digit"
a symbol denoting/representing a natural number ("a numeral")
we'll work with four systems of numerals
roman: I, V, X, L, C, D, M
decimal: 0, 1, ...
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01.01.820 · AE-11500101
Muhammad ibn Musa al-Khwarizmi (c. 780 - 850 A.D.)
persian scholar from golden-age of islamic science
his name Latinized as "Algorithmi" (Port. "guarismo" and Spanish "algarismo" mean digit)
since 820 A.D. the as...
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31.12.849 · AE-11211231
House of Wisdom of Baghdad
8th century - 12th century :: golden-age of islamic science
integration of Persian and Arabic into one cultural realm
translation of Greek and Roman works into a...
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01.01.820 · AE-11500101
Liber Algebræ et Almucabola
book about solving quadratic equations
principial mathematical text-book of European Universities until 16th century
al-ğabr ("forcing", "restoring") operation :: ...
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01.01.820 · AE-11500101
"an algorithm" to solve quadratic equation
If some one says: "You divide ten into two parts: multiply the one by itself; it will be equal to the other taken eighty-one times."
Computation: You say, ten less a thing, mu...
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01.01.820 · AE-11500101
Arithmetics: Dixit algorizmi...
Kitāb al-Jam‘ wat-Tafrīq bi-Ḥisāb al-Hi("The Book of Addition and Subtraction According to the Hindu Calculation")
Arabic original of the book has been lost
12th ce...
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31.12.1201 · AE-7691231
Leonardo Fibonacci of Pisa (c. 1175 c. 1250)
"the most talented Western mathematician of the Middle Ages"
his book Liber Abaci (1202) popularized the Hindu-Arabic numeral systems in Europe
travelled extensivel...
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31.12.1201 · AE-7691231
Fibonacci's sequence :: Rabbits
"Suppose a newly-born pair of rabbits, one male, one female, are put in a field. Rabbits are able to mate at the age of one month so that at the end of its second month a fem...
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31.12.1201 · AE-7691231
modus Indorum :: the method of Indians
"The nine Indian figures are:
9 8 7 6 5 4 3 2 1
With these nine figures, and with the sign 0 which the Arabs call zephir any number whatsoever is written..."
Leonardo Fibonacci...
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31.12.2018 · AE481231
Feedback 0 :: 3 questions
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