Re: [Maxima-discuss] Encoding of bold, underscored, subscripted and superscripted identifiers by wxmaxima

[Martin M. <mar...@gm...>]

In my version it works with ctr+space and ctr+shift+space but thats good
it's like in eclipse
Am 16.12.2015 12:14 nachm. schrieb "Michel Talon" <ta...@lp...>:

> Le 16/12/2015 06:13, Gunter Königsmann a écrit :
> > wxMaxima has autocompletion: Ctrl+Tab autocompletes a command,
> Shift+Ctrl+Tab shows its parameters.
>
> At least with the version of wxmaxima which come with my LTS version of
> Ubuntu, these commands do nothing (in fact insert a Tab). I have other
> problems, for example Ctl-C Ctl-V don't work properly between wxmaxima
> and other windows, etc. Some menu entries crash the program.
> I am under the impression that wxmaxima is mainly tested under Microsoft
> Windows, and probably Mac OS, but free operating systems are second
> class citizens.
>
> To come back to the position of indices, i think it is ill advised to
> denote x[i] as x_i when i belongs to [0-9] as seems to be the case in
> this commit to wxmaxima. Indeed the index is frequently a letter and can
> be either upper or lower (covariant or contravariant). To see typical
> usage, see for example:
> https://en.wikipedia.org/wiki/List_of_formulas_in_Riemannian_geometry
> If you look for example at the Riemann curvature tensor R, the first
> index is upper and the three other ones are lower, R^l_{ijk}. This is a
> property of R and not of ijkl. For example the Ricci tensor is R^l_{ilj}
> with implied summation on index l which appears both upper and lower
> (the so called Einstein contraction) so the position cannot be a
> property of the index, but of the main symbol R. Hence i like much
> better the proposition of Robert Dodier which describes the position of
> indices as property of the main symbol. Of course his way of describing
> this position requires much typing, which i don't like. Some abbreviated
> form like in the TeX usage would have better chance on concrete use, for
> example uddd for the R above, one could imagine
> d|d for one one pre index and one post index, both down, etc.
>
>
> --
> Michel Talon
>
>
>
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