Changes between Initial Version and Version 4 of Ticket #24444


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Timestamp:
12/29/17 16:28:46 (4 years ago)
Author:
egourgoulhon
Comment:

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  • Ticket #24444 – Description

    initial v4  
    33All functionalities of the !CoordinatePatch version (like wedge product and exterior derivative) are implemented in the manifold version, but the manifold one is more recent and provides more functionalities, like
    44
     5- better display capabilities
    56- changing the coordinates (the !CoordinatePatch version assumes a fixed coordinate system)
    67- evaluating the Lie derivative with respect to a vector field
     
    1011It is also more flexible:
    1112
    12 - the indices may be chosen to start from 1 instead of 0
    13 - one may use index notation with summation on repeated indices.
     13- the indices may be chosen to start from 1 (or any other value) instead of 0
     14- one may use index notation with Einstein convention of summation on repeated indices
     15- the base ring is not limited to the Symbolic Ring.
    1416
    1517As this [https://ask.sagemath.org/question/40345/differential-forms-best-package/ ask.sagemath question] reveals, keeping both versions is confusing and the current ticket is devoted to deprecate the !CoordinatePatch version.