let n be Element of NAT ; :: thesis: for seq being Real_Sequence st seq is V49() & seq is V89() holds
( (inferior_realsequence seq) . n = lower_bound seq & inferior_realsequence seq is constant )
let seq be Real_Sequence; :: thesis: ( seq is V49() & seq is V89() implies ( (inferior_realsequence seq) . n = lower_bound seq & inferior_realsequence seq is constant ) )
assume that
A1: seq is V49() and
A2: seq is V89() ; :: thesis: ( (inferior_realsequence seq) . n = lower_bound seq & inferior_realsequence seq is constant )
defpred S₁[ Nat] means (inferior_realsequence seq) . $1 = lower_bound seq;
A3: for k being Nat st S₁[k] holds
S₁[k + 1]

proof

let k be Nat; :: thesis: ( S₁[k] implies S₁[k + 1] )
k in NAT by ORDINAL1:def 12;
hence ( S₁[k] implies S₁[k + 1] ) by A1, A2, Th72; :: thesis: verum

end;

A4: S₁[ 0 ] by A2, Th38;
for k being Nat holds S₁[k] from NAT_1:sch 2(A4, A3);
hence ( (inferior_realsequence seq) . n = lower_bound seq & inferior_realsequence seq is constant ) by VALUED_0:def 18; :: thesis: verum