mailing-list for TeXmacs Users

[vincent douce <address@hidden>]

hi

i am wondering that something simple could be done to make tableaux de variation easy to build inside TeXmacs

some items related with tabulation are missing for the moment :

an equivalent of esc-esc-tab that would not create a blanck space but an extensible diagonale arrow (right-down ↘︎ and right-up ➚)

an equivalent of esc-esc-tab that would  a blanck space with a + or a - at the middle

say, if :

* esc-esc-/ would create and extensible right-up ➚ arrow

* esc-esc-\ would create and extensible right-down ↘︎ arrow

* esc-esc-+ would create and extensible space with a + at the middle

* esc-esc-– would create and extensible space with a - at the middle

then i would create a tableau de variation by making a large bloc with 3 lines and, for example for x|->2x^3-3x^2 :

line 1, column 2 : -∞  esc-esc-tab   0   esc-esc-tab   1   esc-esc-tab  +∞

line 2, column 2 :   esc-esc-+   0   esc-esc-–  0   esc-esc-+ 

line 3, column 2 :  _-∞ esc-esc-/   ^0   esc-esc-–   _-1   esc-esc-+  ^+∞

that remains artisanal, but artisanal is better than impossible

what do you think about that ?

Vincent