theorem Th12:
for
m,
n,
b being
Nat st
b > 1 holds
( (
len (digits (m,b)) < len (digits (n,b)) or (
len (digits (m,b)) = len (digits (n,b)) & ex
i being
Nat st
(
i < len (digits (m,b)) &
(digits (m,b)) . i < (digits (n,b)) . i & ( for
j being
Nat st
j < len (digits (m,b)) &
(digits (m,b)) . j <> (digits (n,b)) . j holds
i >= j ) ) ) ) iff
m < n )