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Annotation of 42BSD/usr.lib/learn/eqn/L9.1a, revision 1.1.1.1

1.1       root        1: #once #create message
                      2: .ND
                      3: .tr %$
                      4: .EQ
                      5: delim $$
                      6: .EN
                      7: .LP
                      8: The next step is to learn about "diacriticals", which
                      9: is a big word for funny marks on symbols, like
                     10: a bar over something ($x bar$), or a tilde or hat on
                     11: something ($x tilde ,~a hat$), or perhaps a dot 
                     12: or dotdot ($T dot ,~U dotdot$), or even an
                     13: underlining like $abc under$.
                     14: 
                     15: These are all easy.  Each funny character
                     16: has a name, and all you have to do is put the name
                     17: after the thing you want the character on.
                     18: Thus
                     19:   x hat makes $x hat$
                     20:   y bar makes $y bar$
                     21:   T dot makes $T dot$
                     22:   x tilde makes $x tilde$ (notice that we spell tilde)
                     23:   u dotdot makes $u dotdot$ (looks ugly on a terminal)
                     24: .br
                     25: and
                     26:   i under makes $i under$.
                     27: 
                     28: Except for "bar" and "under", these are almost always
                     29: attached to just a single letter.
                     30: If you want to put a bar over something longer, like
                     31: ${2 pi +1} bar$, simply enclose the thing in braces:
                     32: 
                     33:   {2 pi +1} bar
                     34: 
                     35: Modify "Example" to produce output that looks like this,
                     36: then type "ready".
                     37: .pl 1
                     38: #once #create Ref
                     39: .EQ
                     40: delim $$
                     41: .EN
                     42: .LP
                     43: Let $x bar$, $y bar$, and $z bar$ be the components of $pi bar$.
                     44: Let ${alpha +1} bar$ be the mean value of $alpha hat$.
                     45: .pl 1
                     46: #once #create Example
                     47: .EQ
                     48: delim $$
                     49: .EN
                     50: .LP
                     51: Let x bar, y bar, and z bar be the components of pi bar.
                     52: Let alpha +1 bar be the mean value of alpha hat.
                     53: .pl 1
                     54: #
                     55: #once neqn Ref | nroff >X1 &
                     56: #once neqn message Ref | nroff -T$term %s/tinyms -
                     57: #user
                     58: neqn Example | nroff >X2
                     59: #cmp X1 X2
                     60: #fail
                     61: Don't forget to set delimiters at the beginning,
                     62: and get the spaces right around the dollar signs.
                     63: #log
                     64: #next
                     65: 9.1b 10
                     66: 9.2a 5

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