[Math] What base is Roman Numerals

number-systems

What is the base for Roman Numerals? It starts off with unary then goes back and forth between multiples of 5 and 10.

Best Answer

I disagree with Henning's and J.M.'s identification of positional systems and systems with a base. There are examples of non-positional systems with a single base (10 in both cases): Egyptian numerals and Chinese numerals. The first footnote in the Wikipedia article on Roman numerals calls them "a decimal system in which the number 5 is an auxiliary base".

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