Symbols:Set Theory/Deprecated Symbols
Deprecated Symbols of Set Theory
This page contains symbols which may or may not be in current use, but are either non-standard in mathematics or have been superseded by their more modern variants.
However, on $\mathsf{Pr} \infty \mathsf{fWiki}$ the intention is to present a consistent style, and so these symbols are to be considered deprecated.
Subset
$\subset$ is sometimes used to mean:
- $S$ is a subset of $T$
in the sense that $S$ is permitted to equal $T$.
That is, for which we have specified as $S \subseteq T$.
Although many sources use this interpretation, it is emphatically not recommended, as it can be the cause of considerable confusion.
Superset
$\supset$ is sometimes used to mean:
- $S$ is a superset of $T$
in the sense that $S$ is permitted to equal $T$.
That is, for which we have specified as $S \supseteq T$.
Although many sources use this interpretation, it is emphatically not recommended, as it can be the cause of considerable confusion.