# proper subset

Let $S$ be a set and let $X\subset S$ be a subset. We say $X$ is a of $S$ if $X\neq S$.

Title proper subset ProperSubset 2013-03-22 11:53:28 2013-03-22 11:53:28 djao (24) djao (24) 7 djao (24) Definition msc 03E20 msc 03B22 msc 03-00 msc 03-01