Definition:Proper Subset/Proper Superset
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Definition
If $S$ is a proper subset of $T$, then $T$ is a proper superset of $S$.
This can be expressed by the notation $T \supsetneqq S$.
This can be interpreted as $T$ properly contains $S$.
Sources
- 1963: George F. Simmons: Introduction to Topology and Modern Analysis ... (previous) ... (next): $\S 1$: Sets and Set Inclusion
- 1965: Seth Warner: Modern Algebra ... (previous) ... (next): Chapter $\text {III}$: The Natural Numbers: $\S 17$: Finite Sets