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References to 'de Morgan's laws'
1. a space is compact iff any family of closed sets having fip has non-empty intersection by CWoo
2. a space is T1 if and only if every subset A is the intersection of all open sets containing A by waj
3. Boolean algebra homomorphism by CWoo
4. Boolean quotient algebra by CWoo
5. Boolean subalgebra by CWoo
6. characterization of $T2$ spaces by matte
7. complete Boolean algebra by CWoo
8. De Morgan algebra by CWoo
9. example of monadic algebra by CWoo
10. ideal inverting in Pr\"ufer ring by pahio
11. index of set theory by rspuzio
12. intuitionistic logic by gribskoff
13. negation by pahio
14. Ockham algebra by CWoo
15. orthocomplemented lattice by CWoo
16. principle of inclusion-exclusion by Mathprof
17. properties of complement by CWoo
18. properties of set difference by CWoo
19. uniquely complemented lattice by CWoo