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`S`:= {<0, 2>, <1, 3>, <2, 4>, <3, 4>, <4, 5>}:`S`= [2, 3, 4, 4, 5].`S`) = 5 and`S`_{0}= 2,`S`_{1}= 3,`S`_{2}= 4,`S`_{3}= 4,`S`_{4}=`5`.**forall**`i`in**N**_{5}: 0 < S_{i}< 10).`T`:= {<`i`,`i`^{2}>:`i`in**N**}:`T`= [0, 1, 4, 9, 16, 25, ...].**forall**`i`in**N**:`S`_{i}=`i`^{2}).

Author: Wolfgang Schreiner

Last Modification: October 14, 1999