[Enhancement] Compability to physics package

[Firestar-Reimu]

The latex physics package define some derivatives:

\dd \dv \pdv \var \fdv

which that: (physics = derivative)

\dd  = \odif
\dv  = \odv
\var = \fdif

I think you can make aliases to enhance the compability to physics package for:

• Frequent users of the legacy physics package;
• Those who have to maintain a document written with physics;
• Users who failed to use unicode-math with physics.

[sjelatex]

While I understand the arguments for compatibility with the syntax of the LaTeX physics package by introducing aliases for derivatives, I made a decision when creating the package not to include aliases for existing commands. The primary reason behind this decision was to mitigate the risk of command collisions with those defined by other packages.

However, users who wish to use aliases for the derivatives defined by this package are welcome to do so. They can define their own variants using the commands outlined in Section 5 of the documentation. For example

\DeclareDifferential{\dd}{\mathrm{d}} % \odif
\DeclareDerivative{\dv}{\mathrm{d}} % \odv
\DeclareDifferential{\var}{\delta} % \fdif

Moreover, the documentation specify how the derivatives are defined by this package.