0 a fraction in which either the numerator (= the number above the line) or the denominator (= the number below the line) is itself a fraction
1 a fraction (= division of a number) in which either the numerator (= number above the line) or the denominator (= number below the line) is itself a fraction
When she jumped up from her easy-chair, she was trying to reduce the following complex fractions, into one simple one, and entirely failed.
To reduce a complex fraction to a simple fraction, treat the longest fraction line as representing division.
A "complex fraction" is a fraction whose numerator or denominator, or both, contains a fraction.
If, in a complex fraction, there is no clear way to tell which fraction lines takes precedence, then the expression is improperly formed, and ambiguous.
Numerators and denominators are also used in fractions that are not "common", including compound fractions, complex fractions, and mixed numerals.
As another example, one might consider the complex fractions.
