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Бөмбөлөг — Википедиа нэвтэрхий толь
Метрийн огторгуй (X, d)-ийн хувьд c цэгийг бэхлэн, уг c цэгээс нэгэн ижил r > 0 зайд орших бүх цэгүүдийн олонлог $${displaystyle U_{r}(c)=U(c;r):={xin Xmid d(x,c)=r}}$$ -ийг c төвтэй, r радиустай бөмбөлөг гэнэ. r → 0 үед {c} хэмээх ганц элемент бүхий олонлог үүсэх тул r = 0 үеийг … See more
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