[unix-history] / usr / lib / learn / eqn / L2.1f

#once #create message
.ND
.LP
One of the most common problems in using neqn is forgetting
to leave spaces or tildes around "magic" words like "pi"
or "int" or "sum".  The result is that the magic words
cease to be magic, and just look like ordinary strings
of letters.

In the file "Example", there are several such errors.
Find them, and fix them so the output looks
like this, then type "ready".
.pl 1
#once #create Ref
.LP
.EQ
sum ~=~ pi ~+~1
.EN
.EQ
a~=~ pi (x)
.EN
.EQ
alpha ~=~ beta ~+~ gamma ~+~ delta
.EN
.pl 1
#once #create Example
.LP
.EQ
sum=pi+1
.EN
.EQ
a=pi(x)
.EN
.EQ
alpha=beta+gamma+delta
.EN
.pl 1
#
#once neqn Ref | nroff >X1 &
#once neqn message Ref | nroff -T$term %s/tinyms -
#user
neqn Example | nroff >X2
#cmp X1 X2
#log
#next
3.1a 10
Commit	Line	Data
48baa1c3 C	1	#once #create message
	2	.ND
	3	.LP
	4	One of the most common problems in using neqn is forgetting
	5	to leave spaces or tildes around "magic" words like "pi"
	6	or "int" or "sum". The result is that the magic words
	7	cease to be magic, and just look like ordinary strings
	8	of letters.
	9
	10	In the file "Example", there are several such errors.
	11	Find them, and fix them so the output looks
	12	like this, then type "ready".
	13	.pl 1
	14	#once #create Ref
	15	.LP
	16	.EQ
	17	sum ~=~ pi ~+~1
	18	.EN
	19	.EQ
	20	a~=~ pi (x)
	21	.EN
	22	.EQ
	23	alpha ~=~ beta ~+~ gamma ~+~ delta
	24	.EN
	25	.pl 1
	26	#once #create Example
	27	.LP
	28	.EQ
	29	sum=pi+1
	30	.EN
	31	.EQ
	32	a=pi(x)
	33	.EN
	34	.EQ
	35	alpha=beta+gamma+delta
	36	.EN
	37	.pl 1
	38	#
	39	#once neqn Ref \| nroff >X1 &
	40	#once neqn message Ref \| nroff -T$term %s/tinyms -
	41	#user
	42	neqn Example \| nroff >X2
	43	#cmp X1 X2
	44	#log
	45	#next
	46	3.1a 10