[unix-history] / usr / lib / learn / eqn / L3.1a

#once #create message
.ND
.PP
Now that we have some of the preliminaries out of the way,
we can get on to doing real mathematics.
I have been slipping small things into the example files
as we go along so that you will at least have seen
some common neqn constructions.

One of the most frequent is the word "sub", which
indicates a subscript, like this:

   .EQ
   x sub i + y sub j
   .EN

which produces
.EQ
x sub i + y sub j
.EN
The main thing to notice is that the blanks are delimiters -
the subscript of "x" is "i"; the blank after the "i" marks
the end of the subscript.

Modify the file "Example" so the equation in it looks like
this:
.EQ
x sub alpha ~=~ y sub pi ~+~ z sub pi
.EN
Then type "ready".
.pl 1
#once #create Ref
.LP
.EQ
x sub alpha ~=~ y sub pi ~+~ z sub pi
.EN
.pl 1
#once #create Example
.LP
.EQ
xxx
.EN
.pl 1
#
#once neqn Ref | nroff >X1 &
#once neqn message | nroff -T$term %s/tinyms -
#user
neqn Example | nroff >X2
#cmp X1 X2
#log
#next
3.1b 10
3.2a 5
Commit	Line	Data
fd15fd37 BJ	1	#once #create message
	2	.ND
	3	.PP
	4	Now that we have some of the preliminaries out of the way,
	5	we can get on to doing real mathematics.
	6	I have been slipping small things into the example files
	7	as we go along so that you will at least have seen
	8	some common neqn constructions.
	9
	10	One of the most frequent is the word "sub", which
	11	indicates a subscript, like this:
	12
	13	.EQ
	14	x sub i + y sub j
	15	.EN
	16
	17	which produces
	18	.EQ
	19	x sub i + y sub j
	20	.EN
	21	The main thing to notice is that the blanks are delimiters -
	22	the subscript of "x" is "i"; the blank after the "i" marks
	23	the end of the subscript.
	24
	25	Modify the file "Example" so the equation in it looks like
	26	this:
	27	.EQ
	28	x sub alpha ~=~ y sub pi ~+~ z sub pi
	29	.EN
	30	Then type "ready".
	31	.pl 1
	32	#once #create Ref
	33	.LP
	34	.EQ
	35	x sub alpha ~=~ y sub pi ~+~ z sub pi
	36	.EN
	37	.pl 1
	38	#once #create Example
	39	.LP
	40	.EQ
	41	xxx
	42	.EN
	43	.pl 1
	44	#
	45	#once neqn Ref \| nroff >X1 &
	46	#once neqn message \| nroff -T$term %s/tinyms -
	47	#user
	48	neqn Example \| nroff >X2
	49	#cmp X1 X2
	50	#log
	51	#next
	52	3.1b 10
	53	3.2a 5