for n being Nat
for seq1 being sequence of (REAL-NS n)
for seq2 being sequence of (REAL-US n) st seq1 = seq2 holds
( ( seq1 is convergent implies ( seq2 is convergent & lim seq1 = lim seq2 ) ) & ( seq2 is convergent implies ( seq1 is convergent & lim seq1 = lim seq2 ) ) )