improved example to only use quotient_definitions; added lemmas to serve as possible replacement for the existing RBT theory
improved example to only use quotient_definitions; added lemmas to serve as possible replacement for the existing RBT theory

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle