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Diffstat (limited to 'usr.bin/learn/lib/eqn/L12.1a')
| -rw-r--r-- | usr.bin/learn/lib/eqn/L12.1a | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/usr.bin/learn/lib/eqn/L12.1a b/usr.bin/learn/lib/eqn/L12.1a new file mode 100644 index 00000000000..a9382b60dac --- /dev/null +++ b/usr.bin/learn/lib/eqn/L12.1a @@ -0,0 +1,53 @@ +#once #create message +.ND +.tr %$ +.EQ +delim $$ +.EN +.LP +The next step is to learn how to put big parentheses, +brackets, braces or bars around equations, like this: +.EQ +left | a sup 2 over b sub i right | +.EN + +This is done with two new words called "left" and "right". +To put bars around something, you simply say, in the middle +of an equation, + left | something right | +and the job is done. +"something" can indeed be anything, from a single letter +up to some horribly complicated mess. +The bars grow to the right height to cover the +"something", automatically. +To produce the example above, all that was needed was + .EQ + left | a sup 2 over b sub i right | + .EN + +For practice, modify file "Example" so it produces output +that looks like this, then type "ready". +.pl 1 +#once #create Ref +.LP +.EQ +left | +{a over b ~+~ c over d} over 2 +right | +.EN +.pl 1 +#once #create Example +.LP +.EQ +replace me +.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 +12.1b 10 |