DEPARTMENT OF MATHEMATICS AND COMPUTER SCIENCE               
                              ODENSE UNIVERSITY                              

                    Set-Pair Method in Extremal Set Theory                   

                               Benjamin Sudakov                              
                       School of Mathematical Sciences                       
                             Tel Aviv University                             

                    Tuesday, February 13, 1996, at 2:15 PM                   
                               The Seminar Room                              


Let S =  { (A_i,B_i) |  1 <= i  <= m  } be a  set system such  that |A_i|=a,
|B_i|=b and, for all i,j, A_i  and B_j are disjoint if  and only if i=j.  B.
Bolobas proved that the size of S is at most (a+b) choose b. We will discuss
applications of this result and its generalizations to extremal set theory.


                                                               Gregory Gutin