1 files changed, 40 insertions, 0 deletions
diff --git a/usr.bin/learn/lib/eqn/L5.1e b/usr.bin/learn/lib/eqn/L5.1e
new file mode 100644
index 00000000000..79a845abad6
--- /dev/null
+++ b/usr.bin/learn/lib/eqn/L5.1e
@@ -0,0 +1,40 @@
+#print
+Once you start using braces, there are a number of
+mistakes that you can make.  For example, you can
+leave a brace out, or you can get them out of order
+(Like } xxx { ), or you can get them in illegal places.
+For all of these, neqn tells you "syntax error",
+then tries to say what file and line numbers are
+involved.
+The line numbers are often not exact, but
+they are very close.  When you get such a message,
+print a line or two before and after the line
+numbers named in the syntax error message.
+
+The file "Example" contains a syntax error.
+What line does neqn believe it begins on?
+Type "answer N", where N is the line number.
+#once #create Example
+.LP
+.EQ 3
+e sup -x sup 2 + e sup -x sub i sup 2 + e sup{-x sub i}sup 2
+.EN
+.EQ 4
+   e sup{-{x sub i sup 2 + y sub i sup 2}over 2}
+= e sup{- x over y}
+.EN
+.EQ 5
+a over b = c over d = A over B times C over D
+.EN
+.EQ 8
+B sub a sub 2 +
+B sub a sup 2 +B{ sub a}sup 2 + (B sub a ) sup 2 + (B sup 2 ) sub a
++B sup 2 sup x
+.EN
+#copyin
+#user
+#uncopyin
+#match 13
+#log
+#next
+5.1f 10