= Unit fraction
{title2=$1/n$}
A <unit fraction> is $1/n$ for a <positive integer> $n$. Its <numerator> is one, so it is already a <reduced fraction>; the <denominator> determines its value uniquely. For example, $1/2$ and $1/7$ are <unit fractions>, while $2/7$ is not.
Every <unit fraction> lies in $(0,1]$, including $1/1=1$. A <rational number> can have several expressions as a <sum> of <unit fractions>: $1/2=1/3+1/6$, for example. An <Egyptian fraction> requires such a finite representation, usually with distinct <denominators>.
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