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Abacus-based mental calculation (AMC), which was derived from the abacus, is the act of performing calculations, including addition, subtraction, multiplication, and division, in the mind by manipulating an imagined abacus. It is a high-level cognitive skill that runs calculations with an effective algorithm.
In classical architecture, the shape of the abacus and its edge profile varies in the different classical orders. In the Greek Doric order, the abacus is a plain square slab without mouldings, supported on an echinus. [2] In the Roman and Renaissance Doric orders, it is crowned by a moulding (known as "crown moulding").
Five groups of markings appear on the tablet. The three sets of Greek symbols arranged along the left, right and bottom edges of the tablet are numbers from the acrophonic system. In the center of the tablet – a set of five parallel lines equally divided by a vertical line, capped with a semicircle at the intersection of the bottom-most ...
Tesserae of a mosaic of doves drinking at a golden basin, 1st century AD, National Archaeological Museum, Naples, Italy A tessera (plural: tesserae, diminutive tessella) is an individual tile, usually formed in the shape of a square, used in creating a mosaic.
Ancient Greek fleuron as an anthemion (Greek word for flower), c. 350 –325 BC, marble, Metropolitan Museum of Art, New York City Ancient Greek Corinthian capital with a fleuron on the abacus , from the tholos at Epidaurus , said to have been designed by Polyclitus the Younger , c. 350 BC, stone, Archaeological Museum of Epidaurus , Greece [ 3 ]
The motif then spread to Persia, Egypt and the Hellenistic world, and as far as India, where it can be found on the abacus part of some of the Pillars of Ashoka or the Pataliputra capital. [4] Bead and reel motifs can be found abundantly in Greek and Hellenistic sculpture and on the border of Hellenistic coins.
The counting board is the precursor of the abacus, [1] and the earliest known form of a counting device (excluding fingers and other very simple methods). Counting boards were made of stone or wood, and the counting was done on the board with beads, pebbles etc. [ 2 ] Not many boards survive because of the perishable materials used in their ...
The book describes methods of doing calculations without aid of an abacus, and as Ore (1948) confirms, for centuries after its publication the algorismists (followers of the style of calculation demonstrated in Liber Abaci) remained in conflict with the abacists (traditionalists who continued to use the abacus in conjunction with Roman numerals).