Oh yes, the chart is wrongly defined. It should be:

|sage: c_xy.<x,y>=U.chart()|

||obviously. I copied it once, changed the variables, and copied it back changing the variables again. Sorry.|
|

What are appropriate settings for a ticket regarding this issue? I'm a ticket virgin.|
|

Am 30.03.2019 um 20:09 schrieb Nils Bruin:
On Saturday, March 30, 2019 at 7:39:51 AM UTC-7, YoungMath wrote:

    Or, maybe, a better approach would be a direct manipulation via
    resu._name and resu._latex_name.

    However, I'm not familiar with the procedure. Furthermore, is this
    mailing list right the place to discuss my written code?


The code you give doesn't reproduce the error you list (I get "y is not defined").

I suspect the problem is that the "wedge" code fails to deal with differential forms that don't have their names set. A workaround would be to set (dummy) names on "unnamed". A fix would consist of letting "wedge" deal with differentials that don't have names set. That's ticket-worthy. Probably the author of the file can fix this pretty quickly (and bang his head on the desk a couple of times in the process).

The doctest example that comes with the function (which you have adapted into your example by the looks of it) shows that "wedge" does work for (at least some) differentials that do have a name.
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