
theorem FibGe2:
  for n being Nat st Fib n > 1 holds
    n > 2
  proof
    let n be Nat;
    assume
A1: Fib n > 1;
    assume n <= 2; then
    n = 2 or n < 2 by XXREAL_0:1;
    hence thesis by A1,FIB_NUM2:47,PRE_FF:1,NAT_1:23;
  end;
