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. 
I live in the US. It seems like the commaanddecimalpoint 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. 
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Writing numbers as 1.234.567,89 is pretty common, even if the USstyle 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. 
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Also, you might see $\displaystyle \mathbb{W}$ for the whole numbers and $\displaystyle \mathbb{H}$ for the irrational numbers. 
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I'm not sure, although the Q symbol might be a reference to "quotient." 
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. 
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