reserve n,m,k,k1,k2 for Nat;
reserve X for non empty Subset of ExtREAL;
reserve Y for non empty Subset of REAL;
reserve seq for ExtREAL_sequence;
reserve e1,e2 for ExtReal;
reserve rseq for Real_Sequence;

theorem Th24:
  inf seq <= sup seq
proof
A1: seq.0 <= sup seq by Th23;
  inf seq <= seq.0 by Th23;
  hence thesis by A1,XXREAL_0:2;
end;
