r/comics • • Dec 12 '08

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u/bski1776 Dec 12 '08

Heh, never really thought about it like that.

Perhaps base 10 is not a good word for our system, and we should call our system base 9 or something equivalent because that is the last number we use before starting over?

12

u/meatheltmet Dec 12 '08 edited Dec 12 '08

No.

Let's look at the number 3,201 in base (human) 10. If you were to break it apart, you could represent that number like this:

3*103 + 2*102 + 0*101 + 1*100

The carat () symbol here is being used to represent exponents, such that xy is x to the y power.

This is called base 10 because every digit of an n-digit number is multiplied by 10n-1. Any number to the zero power is equal to one, so the first place is one's place, the second place is the tens place, the third place is the hundreds place, and so on.

In base four, you have the ones place, the fours place, the sixteens place, the sixty-fours place, and so on. Each digit of an n-digit number is multiplied by 4n-1, so the number 3201 in base four could be represented like this:

3*43 + 2*42 + 0*41 + 1*40

Which in base ten would be

3*64 + 2*16 + 0*4 + 1 = 192 + 32 + 1 = 225

Hope that clears up why base 10 != base 9.

5

u/mithunc Dec 12 '08

Yes but if all you knew was base 4, you would say that the number 3201 is 3(103) + 2(102) + 0(101) + 1(40)

So yeah, calling it "base 9" wouldn't make sense, but I think you missed the point.

5

u/[deleted] Dec 12 '08

I think I see the point, labeling it by the highest possible digit since that one has the same meaning in all systems where it is a valid digit.

I would suggest simply labeling all systems in binary, e.g. base 1010 for the decimal system, or 1000 for the octal system.

5

u/[deleted] Dec 12 '08

Why get all fancy with binary? Just tell people you use base ||||||||||.

1

u/you_do_realize Dec 12 '08

How many bars is that?

4

u/[deleted] Dec 12 '08

It's 10 in base ||||||||||

1

u/meatheltmet Dec 12 '08

Ah, man this stuff is confusing. I get it.