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   <subfield code="a">Nội dung của quyển sách trình bày cơ sở lí thuyết, các bài toán ứng dụng và một số bài tập. Chương 1 trình bày cơ sở lí thuyết về một số không gian hàm và một số ứng dụng của phép tính vi phân. Chương 2 trình bày  cơ sở lí thuyết xấp xỉ đều tốt nhất, nêu một số bài toán. Chương 3 trình bày lí thuyết của phương pháp bình phương tối thiểu.</subfield>
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   <subfield code="a">Mathematical analysis,Approximation theory,Toán tích phân,Lý thuyết xấp xỉ</subfield>
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