1. König's theorem;Grzegorz Bancerek;Formalized Mathematics,1990
2. The "way-below" relation;Grzegorz Bancerek;Formalized Mathematics,1997
3. A kappa-denotational semantics for map theory in ZFC + SI;Chantal Berline;Theoretical Computer Science,1997
4. Functions and their basic properties;Czesław Byliński;Formalized Mathematics,1990
5. The modification of a function by a function and the iteration of the composition of a function;Czesław Byliński;Formalized Mathematics,1990