Symbols:Set Theory/Proper Subset

Proper Subset

 * $\subset$, $\subsetneq$ or $\subsetneqq$

$S \subset T$ means "$S$ is a proper subset of $T$, in other words, $S \subseteq T$ and $S \ne T$.

The symbols $\subset$, $\subsetneq$ and $\subsetneqq$ are equivalent.