reserve P for Subset of TOP-REAL 2,
  f,f1,f2,g for FinSequence of TOP-REAL 2,
  p,p1,p2,q,q1,q2 for Point of TOP-REAL 2,
  r1,r2,r19,r29 for Real,
  i,j,k,n for Nat;

theorem Th26:
  len f <= 2 implies f is unfolded
proof
  assume
A1: len f <= 2;
  let i be Nat such that
A2: 1 <= i;
  assume i+2 <= len f;
  then i+2 <= 2 by A1,XXREAL_0:2;
  then i <= 2-2 by XREAL_1:19;
  hence thesis by A2,XXREAL_0:2;
end;
