Samuel,
In another e-mail that for some reason was not sent (and was completely
deleted...) I mentioned this page
https://en.wikipedia.org/wiki/List_of_mathematical_symbols and standard
ISO 80000-2, which in its clause 9, item 2.9.5 says that symbol for
multiplication is either · or ×, and that they can be omitted if no
misunderstanding is possible, and presents two examples of omission, one
with space, such as /a/ /b/, and one without space, such as /ab/ (I
suppose this is when one has been already using /a/ and /b/ or they are
immediately explained).
I like the space more, it is more general and the only situation where
it would be ambiguous is between numbers, such as 1.234 58 (since the
thousand separator is a short space according to the ISO-BIPM GUM), but
between numbers × is customary.
Regards,
Federico
On 30/10/2019 18:43, Samuel Gougeon wrote:
Le 30/10/2019 à 21:51, Federico Miyara a écrit :
Dear all,
I think a half-high (centered) dot "·" is a better (and more
standard) multiplication sign, it does not take much space and it
cannot be confused with the decimal separator ".", for instance
1 + Ts·s - A·s^2
1 + 2.·s - 0.27·s^2
However, I think the decimal dot shouldn't be used in a block
diagram, its only use is to indicate they are real numbers, but block
diagrams never refer to integers so the decimal dot is somewhat pedantic.
?
When a decimal number is integer, the dot is not displayed. With your
dot, it would give
1 + 2·s - 0.27·s^2
So the confusion could be only with cases like 1 + 2.55.s
I was told that in formulae, the most standard is to use space between
multiplied symbols.
This is what looks the most widely used. Please see for example
https://en.wikipedia.org/wiki/Autocorrelation or any other page using
a lot of maths.
Output with \cdot :
vs wider space
or still wider:
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