There are old numbers 1 2 3 4 5 6 7 8 9 0 all those numbers are supposed to be a

Question

There are old numbers 1 2 3 4 5 6 7 8 9 0
all those numbers are supposed to be angular (not rounded).Sorry,
can't draw them to show. Those are old, initial numbers before they
were totally formed to the form we know today- same numbers just
consist of straight lines. For example -/_ only put together form old
2. And so on. All numbers are angular except 0 which is totally round.

Question: those ancient angular numbers are written with specific
common principle. My teacher said, this principle is obvious, we just
need to think outside the box. What is that principle?

My teacher said that '0' is the biggest hint we have about the
principle. Again, ancient 0 looks absolutely the same way as today's
one- just plain round. There is something in 0 which can give us a
hint about the common principle.

Explanation / Answer

Are you asking about the way that numbers are written, and the history behind their formation? The question isn't clear. I don't really know what "old, angular numbers" means, so I'm going to assume that you mean the most recent set of symbols that look like both European style numbers and Arabic style numbers. Look at "hindu-arabic numerals" and "brahmi numerals" to see if those symbols are the angular numbers your teacher showed you. The number system used in India before modern numbers were invented: http://en.wikipedia.org/wiki/Brahmi_numeral The number system that became western style numbers and eastern arabic numbers: http://en.wikipedia.org/wiki/Hindu%E2%80%93Arabic_numeral_system Western style numbers: http://en.wikipedia.org/wiki/Arabic_numerals Eastern Arabic Numbers: http://en.wikipedia.org/wiki/Eastern_Arabic_numerals What do western style numbers and eastern arabic numbers have in common? They both descend from numbers originally used by Indian, buddhist monks but both use an arabic symbol for zero because the buddhist numbers didn't have a zero. http://en.wikipedia.org/wiki/Indian_numerals I hope this helps, but like I said before: I don't really know what you're asking.

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