The Yupana was a ancient calculating device of the Incas. This simple program compares different theories:
- positional notation
* Base 10 by H. Wassen
(representation, addition)
* Base 10 by W. Burns Glynn
(representation, addition, multiplication)
* Base 40 by N. De Pasquale
- sign-value notation
* Powers of ten by C. Florio
(representation, addition, multiplication)

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