[unix-history] / usr / lib / learn / eqn / L5.1a

#once #create message
.ND
.EQ
delim $$
.EN
.LP
So far we have carefuly skirted around a potential
problem; maybe you've wondered about it.
Suppose we want to produce an equation that looks
like this:
.EQ
x sup { pi + 1 }
.EN
The superscript is complicated, in that it contains
both a $pi$ and a +1, which has to be separated
from the $pi$ by a blank.
But I already told you that a blank terminates
the superscript.  What's going on?

As the first step to finding out, will the input
equation

  x sup pi + 1

produce the output

  $x sup {pi + 1}$ ?
Answer yes or no.
(You can play with the file "Example" if you like.)
.pl 1
#once #create Example
.LP
.EQ
replace me
.EN
.pl 1
#
#once neqn message | nroff -T$term %s/tinyms -
#copyin
#user
#uncopyin
#match no
#log
#next
5.1b
Commit	Line	Data
fd15fd37 BJ	1	#once #create message
	2	.ND
	3	.EQ
	4	delim $$
	5	.EN
	6	.LP
	7	So far we have carefuly skirted around a potential
	8	problem; maybe you've wondered about it.
	9	Suppose we want to produce an equation that looks
	10	like this:
	11	.EQ
	12	x sup { pi + 1 }
	13	.EN
	14	The superscript is complicated, in that it contains
	15	both a $pi$ and a +1, which has to be separated
	16	from the $pi$ by a blank.
	17	But I already told you that a blank terminates
	18	the superscript. What's going on?
	19
	20	As the first step to finding out, will the input
	21	equation
	22
	23	x sup pi + 1
	24
	25	produce the output
	26
	27	$x sup {pi + 1}$ ?
	28	Answer yes or no.
	29	(You can play with the file "Example" if you like.)
	30	.pl 1
	31	#once #create Example
	32	.LP
	33	.EQ
	34	replace me
	35	.EN
	36	.pl 1
	37	#
	38	#once neqn message \| nroff -T$term %s/tinyms -
	39	#copyin
	40	#user
	41	#uncopyin
	42	#match no
	43	#log
	44	#next
	45	5.1b