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Diffstat (limited to 'usr.bin/learn/lib/eqn/L9.1a')
| -rw-r--r-- | usr.bin/learn/lib/eqn/L9.1a | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/usr.bin/learn/lib/eqn/L9.1a b/usr.bin/learn/lib/eqn/L9.1a new file mode 100644 index 00000000000..4a07a8f828e --- /dev/null +++ b/usr.bin/learn/lib/eqn/L9.1a @@ -0,0 +1,66 @@ +#once #create message +.ND +.tr %$ +.EQ +delim $$ +.EN +.LP +The next step is to learn about "diacriticals", which +is a big word for funny marks on symbols, like +a bar over something ($x bar$), or a tilde or hat on +something ($x tilde ,~a hat$), or perhaps a dot +or dotdot ($T dot ,~U dotdot$), or even an +underlining like $abc under$. + +These are all easy. Each funny character +has a name, and all you have to do is put the name +after the thing you want the character on. +Thus + x hat makes $x hat$ + y bar makes $y bar$ + T dot makes $T dot$ + x tilde makes $x tilde$ (notice that we spell tilde) + u dotdot makes $u dotdot$ (looks ugly on a terminal) +.br +and + i under makes $i under$. + +Except for "bar" and "under", these are almost always +attached to just a single letter. +If you want to put a bar over something longer, like +${2 pi +1} bar$, simply enclose the thing in braces: + + {2 pi +1} bar + +Modify "Example" to produce output that looks like this, +then type "ready". +.pl 1 +#once #create Ref +.EQ +delim $$ +.EN +.LP +Let $x bar$, $y bar$, and $z bar$ be the components of $pi bar$. +Let ${alpha +1} bar$ be the mean value of $alpha hat$. +.pl 1 +#once #create Example +.EQ +delim $$ +.EN +.LP +Let x bar, y bar, and z bar be the components of pi bar. +Let alpha +1 bar be the mean value of alpha hat. +.pl 1 +# +#once neqn Ref | nroff >X1 & +#once neqn message Ref | nroff -T$term %s/tinyms - +#user +neqn Example | nroff >X2 +#cmp X1 X2 +#fail +Don't forget to set delimiters at the beginning, +and get the spaces right around the dollar signs. +#log +#next +9.1b 10 +9.2a 5 |