00369nam a2200133 a 450000500170000002000180001708200130003510000230004824500480007126000330011930000270015249000330017970000230021220251203111621.0  a9788184895438  a510bGEL  aGelbaum, Bernard R  aTheorems and counterexamples in Mathematics  aUSAbSpringerc1990 - R 2010  axxxiv,305p.c22cm.bPB  aProblem books in Mathematics  aOlmsted, John M.H,