Newton's method for roots on the soroban

  Sir Isaac Newton A non-traditional technique Square, cube and fifth roots can be solved on the abacus using Newton's method. It is not...

  • The fifth lower bead
    A more efficient use of the abacus Ancient abacuses, both Japanese style (soroban) and Chinese style (suanpan), used to have five beads on t...
  • Txt-abacus
    Text abacus illustrations Txt-abacus is a simple python 3 module I wrote to cover my own needs for illustrating abacus diagrams on my jccAb...
  • Roots a la Knott
     Traditional abacus square and cube roots as explained by Cargill G. Knott I have just uploaded a first draft of my own elaboration on the t...