Originally Posted by

**Enedrox** I was originally born in Switzerland, and then I moved to Australia. Along with the change, I found the difference in symbols used quite different (and sometimes ambiguous)

For example, the multiplication symbol.

$\displaystyle a \times b$ (both) VS $\displaystyle a \cdot b$ (Switzerland) VS $\displaystyle a.b$ (Australia)

Also, the "improper" fraction to be avoided, and instead use the (ambiguous) 1 and 1/2.

$\displaystyle 1 \frac{1}{2}$ (Australia) VS $\displaystyle \frac{3}{2}$ (Switzerland)

And lastly, and most confusing, the decimal symbol (I'm showing three thousand and forty five point seven)

$\displaystyle 3.045,7$ (Switzerland) VS $\displaystyle 3,045.7$ (English) VS $\displaystyle 3,045\cdot7$ (Australia)

I was just wondering whether any of these is standardised worldwide, or whether they are all equally valid. And what do you use?