Ritwik Saha

Okay then! Have a look at the symbolic module. There are many examples on their usage. Let’s start with general coordinate transform then. With this we won’t have the luxury...

See `from_metric` classmethod in `ChristoffelSymbols`, you would understand what `parent_metric` is about. It actually preserves the metric from which other quantities are derived.

@gimseng Yes, you understood this right. Along with transformation of the derived quantity, we also need to transform the metric from which it is derived, and set the new metric...

And this `parent_metric` thing would also apply in general transformations. There's no running from this problem :(

Also, here is a [link](http://www.physicsimplified.com/2014/06/transformation-of-christoffel-symbol.html) detailing mathematics behind transformation of christoffels

Sure ! Open source is people coming together to contribute at their own convenience. Regards, Ritwik > On 14-Feb-2020, at 2:24 PM, Gim Seng wrote: > >  > hi...

@Marlin-Na Thanks for the issue. Would keep the SymEngine issue in tabs.

> If I see correctly, their build is failing in the development version :/ (Not a good sign!) Well, we are going to keep it in tabs, not absolutely committing...

> > If I see correctly, their build is failing in the development version :/ (Not a good sign!) > > What I can tell is that the core C++...

> However, I would suggest to take care of the returned type -- though most of the SymEngine classes are compatible with SymPy, there might be some edge cases and...