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References to 'proper subset'
1. alternative characterizations of Noetherian topological spaces, proof of by yark
2. Anosov diffeomorphism by Koro
3. Cartan's umbrella by jirka
4. characterization of prime ideals by GrafZahl
5. consequence operator by rspuzio
6. defect theorem by Ziosilvio
7. deterministic pushdown automaton by CWoo
8. finite by djao
9. index of set theory by rspuzio
10. lattice ideal by CWoo
11. matroid by mps
12. maximal ideal by djao
13. one-sided normality of subsemigroup by lars_h
14. Riemann mapping theorem by Koro