reserve X,Y for set;
reserve R for domRing-like commutative Ring;
reserve c for Element of R;

theorem Th25:
  for Amp being AmpleSet of R holds NF(0.R,Amp) = 0.R & NF(1.R,Amp) = 1.R
proof
  let Amp be AmpleSet of R;
  1.R in Amp & 0.R is Element of Amp by Def8,Th24;
  hence thesis by Def9;
end;
