On April 23, 2021 3:27:19 AM PDT, Kunhao Zheng <[email protected]> wrote:
> For example, I want to write 
>2121_3 - 212_3 (both in base 3).

The obvious way to represent the left hand number is  ((3 · 2) + ((3 · 1) + ((3 
· 2) + 1))) .

As for whether there is a more convenient notation, have we come up with an 
arbitrary-base version of http://us.metamath.org/mpeuni/df-dec.html or do we 
just have it for base 10?

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