Some journals require upright Greek letters for constants as opposed to variables, for example $\upi$ when used to denote 3.14159... as opposed...
to a variable ($\pi$ is sometimes used to denote parallax in astronomy,
for instance). (Some journals define \upi as "upright pi", \upi as
"upright i", and so on.)
Or is there a difference between mathematical constants and physical constants?
Perhaps because standard (La)TeX provides Greek letters only in math
italic, upright Greek letters are less common than upright Latin
letters, even when used in the same way (labels, units, symbols which
are not variables).
When writing for a specific journal, one usually has to follow the house style. However, if there is no rule, I prefer to do what is generally
deemed to be correct. What is generally deemed to be correct here?
Unicode changed that by adding those as characters (code points), in
addition adding some styles that are not properly semantic, like sans
serif and monospace variations. (The sans serif style is used for
tensors by some engineers, but I have found no example in mathematics, physics or computer science of that.)
[[Mod. note -- Checking a few general-relativity textbooks, I see that Misner, Thorne, & Wheeler "Gravitation" (W.H. Freeman, 1973) uses sans
serif for tensors and differential forms, but none of the other books
I checked do this.
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