Le 16-août-06, à 22:54, John M a écrit :

>> But "2" is just another notation for "xx".
> Why is "x" 'just another notation for "2"? or
> why is "xx" not (just) a notation of 3?

Mathematician have all the right! As a mathematician you are free to 
name the number two as you want. *polite* mathematician, or just those 
who want to be as simple as possible will try to use the more standard 
notation. naming 3 by "xx" could be confusing in that respect.

> (because Peano said so?)

There is no authoritative argument in math. There are fashion, 
prejudice, stubbornness and many human things like that, but nobody 
serious in math will believe something because the boss said so.



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