Re: [groff] Support groups

[ansgoati al]

I need a table with a title in the center and then two numbered columns of 
mathematical equations.
It might not be a table but I don't know how to make a list of several columns.
My questions are:
How to change row height of tables?
How to move the equation a little to the left and not exceed the margin of the 
box?
Why is the square root surrounded by small boxes?

Code:

.EQ
delim $&
.EN
.EQ
define ddx "d over dx"
.EN

.TS
box expand tab (@);
c c cb s
c c c s
l0 ls r0 la.
@@Derivatives and Integrals
@@Basic Derivation Rules

$bold "15."~~ @ ddx [sec~u] =~~ (sec~u~tg~u){u prime} @ bold "16."~~ @ ddx 
[cosec~u] =~~ -(cosec~u~ctg~u){u prime}&
$bold "21."~~ @ ddx [arcsec~u] =~~ {u prime} over {|u| sqrt {{u sup 2} - 1}} @ 
bold "22."~~ @ ddx [arccosec~u] =~~ {u prime} over {|u| sqrt {{u sup 2} - 1}}&
.TE

I compile it with some warnings that i don't konw.

groff -e -t -Tpdf tequestion.ms > eqnq.pdf
eqn:tequestion.ms:18: unquoted escape
eqn:tequestion.ms:20: unquoted escape
eqn:tequestion.ms:22: unquoted escape
eqn:tequestion.ms:19: unquoted escape
eqn:tequestion.ms:21: unquoted escape
eqn:tequestion.ms:23: unquoted escape
eqn:tequestion.ms:16: unquoted escape
eqn:tequestion.ms:16: unquoted escape
eqn:tequestion.ms:16: unquoted escape
eqn:tequestion.ms:17: unquoted escape
eqn:tequestion.ms:17: unquoted escape
eqn:tequestion.ms:17: unquoted escape
tequestion.ms:88: warning: can't find special character `tbl'
tequestion.ms:88: warning: can't find special character `EQ'
tequestion.ms:88: warning: can't find character with input code 2
tequestion.ms:88: warning: can't find character with input code 3

Thanks for the help.
________________________________
From: Ingo Schwarze <address@hidden>
Sent: Friday, August 16, 2019 2:39 PM
To: address@hidden <address@hidden>
Cc: address@hidden <address@hidden>
Subject: Re: [groff] Support groups

Hi,

ansgoati al wrote on Fri, Aug 16, 2019 at 07:27:27PM +0000:

> Could you tell me if there are more places where I can get groff
> support ? Facebook groups, IRC, forums etc.

Quite plainly: no, i'm not aware of any.

> I am beginning to learn and I have some doubts that I would like
> to solve.

Read the documentation first.  If a question should still remain
after that, try to ask it in a way that is as specific as possible,
ideally providing a minimal example (what do exactly do you type,
what do you expect to happen, what exactly happens instead).

Yours,
  Ingo