abaci

• “Studies have shown that kids who master abaci have a better comprehension of math.”

  Dyscalculia: If I were king...

• “Alas, abaci have already been commoditized --you can own your own franchise!”

  Dyscalculia: If I were king...

• “Digital calculators notwithstanding, some abaci can still be found in a grade school classroom or two.”

  Forbes: Crazy Twists On Ancient Technology

• “An early example of a course-of-value recursion was given by Leonardo da Pisa, also called Fibonacci, in his Liber abaci, written in 1202 and revised in 1228, when discussing the famous rabbit problem (paria coniculorum):”

  Recursive Functions

• “Also in the West, this kind of mathematics came fully to surface only after seven centuries or so, in the famous Liber abaci of Leonardo of Pisa (Fibonacci) around 1200 A.D.”

  Dictionary of the History of Ideas

• “The transepts are of the transitional style of the end of the twelfth century; the piers which carry the central tower are of the usual transitional type, having graceful capitals and square abaci supporting round arches; on each side of the north transept there are two original clerestory windows, and one of them has angle shafts, with carved caps and mouldings.”

  Scottish Cathedrals and Abbeys

• “These rest on triple shafts, with carved caps and rounded abaci.”

  Scottish Cathedrals and Abbeys

• “The arcade consists of low massive circular piers, with cushion capitals and plain chamfered abaci, which support semi-circular arches of one order also chamfered.”

  Bell's Cathedrals: The Cathedral Church of Durham A Description of Its Fabric and A Brief History of the Espiscopal See

• “The abaci are square and moulded, while the caps proper carry at their angles rudely carved volutes such as occur in the White Tower, London.”

  Bell's Cathedrals: The Cathedral Church of Durham A Description of Its Fabric and A Brief History of the Espiscopal See

• “Penrose and most writers who followed him supposed the "scamilli impares" to be projections or offsets on the stylobate required on account of the curves to bring the column into relation with the architraves above, and similar offsets of unequal or sloping form were supposed to be required above the abaci of the capitals, but such offsets, although sometimes existing, have no obvious connection with the passage in Vitruvius.”

  The Ten Books on Architecture

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