Originally posted by TheFaQQer
View Post
Despite the lack of standardization, an additional set of rules has been frequently applied for the last few hundred years:
Following this additional set of rules, there is only one possible Roman numeral for any given number.
- The symbols "I", "X", "C", and "M" can be repeated three times in succession, but no more. (They may appear four times if the third and fourth are separated by a smaller value, such as XXXIX.) "D", "L", and "V" can never be repeated.
- "I" can be subtracted from "V" and "X" only. "X" can be subtracted from "L" and "C" only. "C" can be subtracted from "D" and "M" only. "V", "L", and "D" can never be subtracted
- Only one small-value symbol may be subtracted from any large-value symbol.
- A number written in Arabic numerals can be broken into digits. For example, 1903 is composed of 1, 9, 0, and 3. To write the Roman numeral, each of the non-zero digits should be treated separately. In the above example, 1,000 = M, 900 = CM, and 3 = III. Therefore, 1903 = MCMIII.
Following this additional set of rules, there is only one possible Roman numeral for any given number.
Leave a comment: