> >> On output 'box' is invisible but 
> > 
> > Indeed, but tex or html output uses  parens ... so I'm wondering why not 
> in 
> > algebraic mode? 
> > 
>
> ?? I do not see any parenthesis printed for 'box'  in either algebraic 
> or tex output 
>
> (1) -> )set output tex on 
> (1) -> box(x) 
>
>    (1)  x 
> $$ 
> x 
> \leqno(1) 
> $$ 
>
>                                                     Type: 
> Expression(Integer) 
> (2) -> paren(x) 
>
>    (2)  (x) 
> $$ 
> \left( 
> x 
> \right) 
> \leqno(2) 
> $$ 
>
>
You're right, but see (2) below:

(1) -> )set output tex on
(1) -> )set output html on
(1) -> box(a+b)

   (1)  b + a
$$
{b+a} 
\leqno(1)
$$

b+a
 

                                                    Type: 
Expression(Integer)
(2) -> c*box(a+b)

   (2)  cb + a
$$
c \  {\left( {b+a} 
\right)}
\leqno(2)
$$

c
*
(
b+a
)
 

                                                    Type: 
Expression(Integer)
 

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