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Numbers' & Numeral
systems' history and curiosities


Origins
of the Numerals 
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Today's
numbers, also called HinduArabic numbers, are
a combination of just 10 symbols or digits: 1, 2, 3,
4, 5, 6, 7, 8, 9, and 0. These digits were introduced
in Europe within the XII century by Leonardo
Pisano (aka Fibonacci),
an Italian mathematician. L. Pisano was educated in North
Africa, where he learned and later carried to Italy the
now popular HinduArabic numerals.
Hindu
numeral system is a pure placevalue
system, that is why you need a zero.
Only the Hindus, within the context of IndoEuropean
civilisations, have consistently used a zero. The Arabs,
however, played an essential part in the dissemination
of this numeral system.

Numerals,
a time travel from India to Europe
The
discovery of zero and the placevalue system were inventions
unique to the Indian civilization. As the Brahmi notation of
the first 9 whole numbers...
The
numeral set used in the Middle East today is a cousin of
the modern numeral set, with a common ancestor in
the ancient Hindu numerals. In fact, the Eastern
Arabic numerals (also called Arabic–Indic
numerals) are specific numerals currently
used to represent the Hindu–Arabic numeral system
in conjunction with the Arabic alphabet in the countries
of the Arab east, and its variant (Persian numerals)
in other countries. 
However,
the first Western use of the digits, without
the zero, was reported in the Vth century by Beothius,
a Roman writer. Beothius explains, in one of his geometry
books, how to operate the abacus using marked small cones
instead of pebbles. Those cones, upon each of which was
drawn the symbol of one of the nine HinduArabic digits,
were called apices. Thus, the early
representations of digits in Europe were called “apices”.
Each apex received also an individual name: Igin for
1, Andras for 2, Ormis for
3, Arbas for 4, Quimas (or
Quisnas) for 5 , Caltis (or Calctis)
for 6, Zenis (or Tenis) for 7, Temenisa for
8, and Celentis (or Scelentis) for 9.
The etymology of these names remains unclear, though
some of them were clearly Arab numbers. The HinduArabiclike
figures reported by Beothius were reproduced almost everywhere
with the greatest fantasy! (see below)

Before
adopting the HinduArabic numeral system, people used
the Roman figures instead, which actually are
a legacy of the Etruscan period. The Roman numeration
is based on a biquinary (5) system.
To
write numbers the Romans used an additive system: V + I + I = VII (7)
or C + X + X + I (121), and
also a substractive system: IX (I before X =
9), XCIV (X before C = 90 and I before V =
4, 90 + 4 = 94). Latin numerals were used for reckoning
until late XVI century!

The
graphical origin of the Roman numbers
©19922011,
Sarcone & Waeber



Other
original
systems of numeration 


Other
original systems of numeration were being used in the past.
In the
earlier 13th century, the Archdeacon John of Basingstoke
introduced a notation for numbers between 1 and 99 based
on a vertical stroke provided with an appendage to the
left (representing units) and another to the right (tens).
Divers variants of the system turn up in various Cistercian
manuscripts, and were used for a variety of purposes, along
with Roman and HinduArabic numerals.
In 1533, Agrippa
von Nettesheym included a description of a “vertical” variant
of the ciphers in his Occult Philosophy.
From then on and until the 19th century, the ciphers were
remembered as “Chaldaean”. In early 20thcentury
Germany they turned Runic and Aryan. This original numeral
system later fell out of use and was forgotten.
Agrippa’s numbernotation system called “Notae
Elegantissimae” allows to write numbers from 1 up
to 9999 and was primarily employed for indexing
purposes, where its compactness was a great advantage. But
it is also useful as a mnemonic aid, e.g. the symbol K in
the example further below may mean 1414 (the first 4 figures
of the square root of 2).




Chinese
and Japanese
contributions 


The BaGua trigrams
(pron. pahkwah, 八卦) and the GenjiKô patterns
(源氏香), antique Chinese and
Japanese symbols, are strangely enough related to mathematics
and electronics. If all the entire lines of the trigrams
(^{___}) are replaced with the digit 1 and the
broken lines (^{_ _}) with the digit 0, each BaGua
trigram will then represent a binary number from 0 to 7.
You can also notice that each
number is laid in front of its complementary: 0<>7,
1<>6, 2<>5, etc.

The "GenjiKô" (源氏香)
symbols used for the chapters of the Tale of
Genji (early Japanese novel) indicate the
possible groupings and subgroupings of 5 elements. For
instance, if you write down "a", "b", "c", "d" and "e" beneath
the five small red sticks of each GenjiKô pattern,
you will obtain 52 distinct ways to connect 5 variables
in Boolean algebra. The linked sticks form a "conjunction" (AND, ∨),
and the isolated sticks or groups of sticks form a "disjunction" (OR, ∧).
The pattern at the top left represents:
[("a" and "d") or ("b" and "e")
or "c"]

©19922011,
Sarcone&Waeber, all rights reserved
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are encouraged to expand and/or improve this article. Send
your comments, feedback or suggestions to Gianni
A. Sarcone. Thanks! 
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Gianni A. Sarcone, ArchimedesLab.org. Used with the permission".
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