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+% plain format
+\input iwona-math
+\seventeenpoint
+
+\font\bigbf=qx-iwonam at17pt
+\nopagenumbers
+
+\centerline{\bigbf Mathematical Examples Typeset with Iwona}
+\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
+
+$${(n_1^2<n_2+\cdots+n_m)!\over n_1!\,n_2!\ldots n_m!}
+  ={n_1+n_2\choose n_2}{n_1+n_2+n_3\choose n_3}
+    \ldots{n_1+n_2+\cdots+n_m\choose n_m}.$$
+
+\bigskip
+
+$$\def\\#1#2{(1-q^{#1_#2+n})} % to save typing
+\Pi_R{a_1,a_2,\ldots,a_M\atopwithdelims[]b_1,b_2,\ldots,b_N}
+  =\prod_{n=0}^R{\\a1\\a2\ldots\\aM\over\\b1\\b2\ldots\\bN}.$$
+
+\bigskip
+
+$$\{\underbrace{\overbrace{\mathstrut {\mit \Psi},\ldots,\Psi}
+      ^{k\;a\mathchar`'\rm s},
+    \overbrace{\mathstrut {\cal A},\ldots,{\cal B}}
+      ^{l\;b\mathchar`'\rm \acute{s}}}_{k+l\rm\;element}\}.$$
+
+\bigskip
+
+$$\pmatrix{\pmatrix{a&b\cr c&d\cr}&
+             \pmatrix{e&f\cr g&h\cr}\cr
+           \noalign{\smallskip}
+           0&\pmatrix{i&j\cr k&l\cr}\cr}.$$
+
+\bigskip
+
+$$\det\left[\,\matrix{
+  c_0&c_1\hfill&c_2\hfill&\ldots&c_n\hfill\cr
+  c_1&c_2\hfill&c_3\hfill&\ldots&c_{n+1}\hfill\cr
+  c_2&c_3\hfill&c_4\hfill&\ldots&c_{n+2}\hfill\cr
+  \,\vdots\hfill&\,\vdots\hfill&
+       \,\vdots\hfill&&\,\vdots\hfill\cr
+  c_n&c_{n+1}\hfill&c_{n+2}\hfill&\ldots&c_{2n}\hfill\cr
+  }\right)>0.$$
+
+\bye