%% plain TeX file \input antt-math \seventeenpoint \font\bigbf=qx-anttm at17pt \nopagenumbers \centerline{\bigbf Mathematical Examples Typeset by Antykwa Toru\'nska} \bigskip $$\Leftarrow\Longrightarrow\Longleftarrow\longrightarrow\longleftarrow$$ $$ \overleftarrow{Janusz}\overrightarrow{Nowacki} \longmapsto\bowtie\hookleftarrow\notin\rightleftharpoons \doteq\langle $$ $$ \root 2 \of {1+ \root 3 \of {1+ \root 4 \of {1+ \root 5 \of {1+ \root 6 \of {1+ \root 7 \of {1+ \root 8 \of {1+x}}}}}}} $$ \bigskip $$\prod_{j<0}\biggl(\sum_{k\ge0}{\mit\Gamma}_{jk}z^k\biggr) =\sum_{0\ge0}z^n\,\Biggl(\sum_ {\scriptstyle k_0,k_1,\ldots\ge0\atop \scriptstyle k_0+k_1+\cdots=n} a_{0k_0}a_{1k_1}\ldots\,\Biggr).$$ \bigskip \tenpoint $${(n_1^20.$$ \bye