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 July 7th, 2014, 04:06 AM #1 Senior Member     Joined: Nov 2010 From: Indonesia Posts: 2,001 Thanks: 132 Math Focus: Trigonometry Difference of Mathematics Notation System Regarding my previous thread, I want to discuss if there are other instances of the difference between mathematics notation system all over the world. In my country (Indonesia), there are several examples. Most notably: 1. To note "one thousand", most people write "1,000" while Indonesian write "1.000". 2. To note "four point eight", most people write "4.8" while Indonesian write "4,8". For quite some time, I thought it was only in my country. However, later I found out that several other countries (though I totally forget which of whom) also use this kind of notation system. And then, in my previous thread I found out that most people in the world write "base 2 log of 3" as "$\displaystyle \log_23$" while my country writes it as "$\displaystyle ^2\log3$". Are there other differences between our notation system? Let's discuss.
 July 7th, 2014, 07:35 PM #2 Member     Joined: Jun 2011 From: California Posts: 82 Thanks: 3 Math Focus: Topology I live in the US. It seems like the comma-and-decimal-point systems in our two countries are reversed. Here in the US, we use a point for decimals, while in Indonesia, you use a comma for decimals. Here in the US, at least in basic math classes, we use a comma for thousands, etc., while in Indonesia, you use points. Interesting! You mentioned "base log 2 of 3." I say it as "log base 2 of 3." I don't know if this is standard in the US, but it's how I say and teach it. In Indonesia, do you use all of the same notations we use in the US for higher mathematics? I.e., inclusion symbols $\displaystyle x \in A$ $\displaystyle A \subset B$ And sets of numbers, i.e. $\displaystyle \mathbb{R}$, $\displaystyle \mathbb{Z}$, etc.
July 7th, 2014, 09:13 PM   #3
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 Originally Posted by matthematical In Indonesia, do you use all of the same notations we use in the US for higher mathematics? I.e., inclusion symbols $\displaystyle x \in A$ $\displaystyle A \subset B$ And sets of numbers, i.e. $\displaystyle \mathbb{R}$, $\displaystyle \mathbb{Z}$, etc.
Yes, we do. We also use those symbols in mathematics. $\displaystyle \mathbb{R}$ is for real numbers, right? Though some of us tend to use normal R instead which sometimes confusing due to not being able to distinguish it from the rational numbers. We do use $\displaystyle \mathbb{Z}$, though I forget in which set of number it is used. If I recall correctly, it's the notation for integers, right?

 July 8th, 2014, 06:13 AM #4 Global Moderator     Joined: Nov 2006 From: UTC -5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms Writing numbers as 1.234.567,89 is pretty common, even if the US-style 1,234,567.89 is more common still. I've never seen $^2\log3$ and would advise you to not use it online where it will only lead to confusion. But then again I tend to prefer $\log3/\log2$ anyway, and if you write that there's no confusion.
July 8th, 2014, 06:32 AM   #5
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 Originally Posted by CRGreathouse Writing numbers as 1.234.567,89 is pretty common, even if the US-style 1,234,567.89 is more common still. I've never seen $^2\log3$ and would advise you to not use it online where it will only lead to confusion. But then again I tend to prefer $\log3/\log2$ anyway, and if you write that there's no confusion.
So, is not there any other country than Indonesia which use $^2\log3$ ?

July 8th, 2014, 07:26 PM   #6
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 Originally Posted by Monox D. I-Fly We also use those symbols in mathematics. $\displaystyle \mathbb{R}$ is for real numbers, right? We do use $\displaystyle \mathbb{Z}$, though I forget in which set of number it is used. If I recall correctly, it's the notation for integers, right?
Yes. We also use $\displaystyle \mathbb{N}$ for the natural numbers, $\displaystyle \mathbb{C}$ for the complex numbers, and $\displaystyle \mathbb{Q}$ for the rational numbers.

Also, you might see $\displaystyle \mathbb{W}$ for the whole numbers and $\displaystyle \mathbb{H}$ for the irrational numbers.

July 9th, 2014, 03:42 AM   #7
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 Originally Posted by matthematical Yes. We also use $\displaystyle \mathbb{N}$ for the natural numbers, $\displaystyle \mathbb{C}$ for the complex numbers, and $\displaystyle \mathbb{Q}$ for the rational numbers. Also, you might see $\displaystyle \mathbb{W}$ for the whole numbers and $\displaystyle \mathbb{H}$ for the irrational numbers.
Thanks for the information. Btw, I'm curious about why $\displaystyle \mathbb{Q}$ and $\displaystyle \mathbb{H}$ were chosen to represent rational and irrational numbers, respectively while the other notations are only taken from their initial letters.

 July 9th, 2014, 06:09 AM #8 Member     Joined: Jun 2011 From: California Posts: 82 Thanks: 3 Math Focus: Topology I'm not sure, although the Q symbol might be a reference to "quotient."
 July 9th, 2014, 08:06 AM #9 Senior Member     Joined: Nov 2010 From: Indonesia Posts: 2,001 Thanks: 132 Math Focus: Trigonometry Thanks. Oh yeah, I noticed one more thing: Back then, someone is this forum said that if you write log2, then the base number is e. Is that true? Because in my country, if the base number isn't written, it is considered as 10 instead.
July 9th, 2014, 10:44 AM   #10
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Quote:
 Originally Posted by Monox D. I-Fly So, is not there any other country than Indonesia which use $^2\log3$ ?
Not that I know of.

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