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ümbruste hulga alamhulk topoloogilises ruumis, mille korral mistahes ümbrus sisaldab mingit elementi sellest alamhulgast
ümbruste baas . Matemaatika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mat/%C3%BCmbruste%20baas/1/est (01.07.2026)