Giáo trình chương 7: Hàm nhiều biến | Môn toán cao cấp

Giả sử A là tập hợp trong R". Điểm xe A được gọi là điểm trong của A nếu tồn tại một ɛ - lân cận nào đó của x nằm hoàn toàn trong A. Tập A được gọi là tập mở nếu mọi điểm của A đều là điểm trong.Tài liệu giúp bạn tham khảo, ôn tập và đạt kết quả cao. Mời bạn đọc đón xem !

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