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(/usr/local/share/texmf/tex/latex/amsfonts/umsb.fd File: umsb.fd 2002/01/19 v2.2g AMS font definitions ) Package amsmath Warning: Foreign command \atopwithdelims; (amsmath) \frac or \genfrac should be used instead (amsmath) on input line 96. [1] [2] [3] ! Missing $ inserted. $ l.217 \bullet \bullet ... \bullet & \mid & \bullet \bullet ... \bullet & \mi... I've inserted a begin-math/end-math symbol since I think you left one out. Proceed, with fingers crossed. ! Extra }, or forgotten $.