What do you prefer,
1 \times 10^{10} or 1E10.A "reduced fraction" is a fraction that has the smallest possible integer numerator and denominator for its value.
For example:
is not a reduced fraction, because there is another fraction equal to it but with smaller numerator and denominator:
en.wikipedia.org/w/index.php?title=Farey_sequence&oldid=1223364653#Sequence_length_and_index_of_a_fraction
where is the totient summatory function.
A good definition is by using Dedekind cuts.
