--- /dev/null
+This is TeX, Version 3.14159 (Web2C 7.3.7) (format=tex 2002.8.9) 23 NOV 2002 18:34
+**$$\root 3 \of x+1$$
+(/usr/share/texmf/tex/latex/tools/.tex File ignored)
+! Missing $ inserted.
+<inserted text>
+ $
+<to be read again>
+ \mathchoice
+\mathpalette #1#2->\mathchoice
+ {#1\displaystyle {#2}}{#1\textstyle {#2}}{#1\...
+<*> $$\root 3 \of x
+ +1$$
+?
+
+*
+! Emergency stop.
+<*> $$\root 3 \of x+1$$
+
+End of file on the terminal!
+
+No pages of output.