[tex-eplain] boldface greek symbols

[Gérald Tenenbaum]

I want to display computations with multidimentional vectors, coded with 
boldface greek letters. These vectors are submitted to a number of 
constraints indicated in subscripts under the \sum signs.

Laurence.Finston at gmx.net a écrit le 27/8/23 à 12:05 :
> If you don't mind my asking, is there a reason why you would need both 
> bold face _and_ subscripts?  With all due respect, it seems like this 
> might be like wearing a belt and suspenders.
> *Gesendet:* Sonntag, 27. August 2023 um 11:56 Uhr
> *Von:* Laurence.Finston at gmx.net
> *An:* "Gérald Tenenbaum" <gerald.tenenbaum at univ-lorraine.fr>
> *Cc:* "Eplain" <tex-eplain at tug.org>
> *Betreff:* Aw: Re: [tex-eplain] boldface greek symbols
> In math mode, material in an hbox is formatted in horizontal mode. I 
> don't see the necessity of assigning to \textfont1.  If you just want 
> to use these characters once in a while, you can pick a size and use 
> hboxes.  You could define a family, but I don't think it's meant to 
> work that way.  You want to use individual characters from this font 
> with the normal family.  Since you can put the hboxes into macro 
> definitions, I think this solution would be adequate.  If you're only 
> using a few bold Greek letters, it doesn't seem like it would be worth 
> it to me to define \textfont, \scriptfont and \scriptscriptfont.  
> However, it would certainly be possible.  I'm not sure how switching 
> families in the middle of an equation would work, since I've never 
> tried to do this.  I think it would inadvisable.
> *Gesendet:* Sonntag, 27. August 2023 um 11:41 Uhr
> *Von:* "Gérald Tenenbaum" <gerald.tenenbaum at univ-lorraine.fr>
> *An:* "Philip Taylor (Hellenic Institute)" 
> <P.Taylor at Hellenic-Institute.Uk>
> *Cc:* "Eplain" <tex-eplain at tug.org>
> *Betreff:* Re: [tex-eplain] boldface greek symbols
> Thanks.
> Yes it suffices, but I also need these boldface letters in subscripts.
> I am puzzled by the necessity of using \hbox. Can't one design a 
> setting working like \bf or \it ?
> Regards,
>
> Gérald
>
> Philip Taylor (Hellenic Institute) a écrit le 27/8/23 à 11:21 :
>
>     You don't appear to be using \gpfam, Gérald — will not the
>     following suffice ?
>
>
>     \font \tengp = cmmib10
>     \def \gp {\textfont 1 = \tengp}
>     \def \gth {\hbox {$\gp \vartheta $}}
>     $\gth \neq \vartheta $
>     \end
>
>     --
>     /Philip Taylor/
>

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