olymmath

Putnam 1957 B5

  • Session B
  1. With each subset XX of a set is associated a second subset f(X)f(X). The association is such that whenever XX contains YY then f(X)f(X) contains f(Y)f(Y). Show that for some set A,f(A)=AA, f(A)=A.

Dataset text PutnamGAP. Quoted with source.

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