T for true, and true for T (was Re: [Maxima] emaxima's macros bug?)

Valerij Pipin <pip@iszf.irk.ru> writes:

> Hi,
>
> I'm writing an introduction to itensor with help of emaxima mode.
> I found an unusual behaviour. Look in the attachment.
> The name of tensor "t" was replaced by name "true" (lisp's caused??) after TeX 
> updation the  cell. Everything is ok when another name is used.

Maxima seems to interpret that particular "t" as "true".  I don't
think this is peculiar to emaxima mode; in an ordinary maxima session,
I get the following: 
(C1) permut_ten(T([i],[l,m],p,q),covd);

(D1) 		    permut_ten(T([i], [l, m], p, q), covd)
(C2) tex(%);

$$\mathrm{permut\_ten}\left(\mathbf{true}\left(\left[ i \right] 
 ,\linebreak[0]\left[ l,\linebreak[0]m \right] ,\linebreak[0]p
 ,\linebreak[0]q\right),\linebreak[0]\mathrm{covd}\right)$$
(D2) 				     FALSE

After playing with it some, it seems that in t,T, and t(), the "t" is
not interpreted as "true", but in T(), the "t" is interpreted as
"true".  Odd, I think, but I'm sure there's a good reason for it.

(C17) t; T; t(); T();

(D17) 				       t
(C18) 
(D18) 				       T
(C19) 
(D19) 				      t()
(C20) 
(D20) 				      T()
(C21) tex(t);tex(T);tex(t());tex(T());

$$t$$
(D21) 				     FALSE
(C22) 
$$T$$
(D22) 				     FALSE
(C23) 
$$t\left(\right)$$
(D23) 				     FALSE
(C24) 
$$\mathbf{true}\left(\right)$$
(D24) 				     FALSE
(C25) 

Jay