Is the division symbol $\div$ acceptable based on international standards? The division symbol $\div$ is found in almost all calculators; however, I seldom see it in any formal writing. It seems people almost exclusively prefer $\frac{a}{b}$, $a/b$ or $ab^{-1}$ to $a\div b$. Is the symbol $\div$ considered outdated today? Is it all right to use it in formal writtings (for example, denote $ab^{-1}$ by $a\div b$ when $a$ and $b$ are elements in a field such that $b\neq 0$)?
Edit: Since the question was on hold since it is "opinion based", I would like to reask my question in the following way:
Is the usuage of the symbol $\div$ in professional mathematical writtings acceptable based on objective international standards, such as ISO 80000-2?

The $\div$ symbol is outdated and should be avoided.
Quoting from Florian Cajori's book A History of Mathematical Notations.
(Volume I, Chapter III, Part B, Paragraph $243$ A critical Estimate of $:$ and $\div$ as Symbols)

In 1923 the National Committee on Mathematical Requirements voiced the following opinion:

"Since neither $\div$ nor $:$, as signs of division plays any part in business life, it seems proper to consider only the needs of algebra, and to make more use of the fractional form and (where meaning is clear) of the symbol $/$, and to drop the symbol $\div$ in writing algebraic expressions."


