CANTOR SETS AND FIELDS OF REALS

Abstract

Our main result is a constructionof four families ${\cal C}_1,{\cal C}_2,{\cal B}_1,{\cal B}_2$which are equipollent with the power set of ${\Bbb R}$and satisfy the following properties.(i) The members of the families are proper subfields $K$ of ${\Bbb R}$where ${\Bbb R}$ is algebraic over $K$.(ii) Each field in ${\cal C}_1\cup{\cal C}_2$ contains a {\it Cantor set}.(iii) Each field in ${\cal B}_1\cup{\cal B}_2$ is a {\it Bernstein set}.(iv) All fields in ${\cal C}_1\cup{\cal B}_1$ are isomorphic.(v) If $K,L$ are fields in${\cal C}_2\cup{\cal B}_2$ then $K$ is isomorphic to somesubfield of $L$ only in the trivial case $K=L$.