Một số kết quả đáng quan tâm

 

Chuỗi Fourier

https://vanchanh123.wordpress.com/2014/04/13/chuoi-fourier/

 

Xem thêm trong cuốn sách về lý thuyết xấp xỉ trên thư viện.

 

 

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distance between sets in a metric space

 

http://math.stackexchange.com/questions/652932/distance-between-sets-in-a-metric-space

Showing the distance between sets is indeed a metric.

http://math.stackexchange.com/questions/237457/showing-the-distance-between-sets-is-indeed-a-metric?rq=1

 

 

 

 

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Lemma 2.10. The number of positive eigenvalues of a real symmetric matrix
equals the number of sign changes in the coefficient sequence of its characteristic polynomial.

Cite from  page 28 Solving Systems of Polynomial Equations, Bernd Sturmfels

 

 

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Vấn đề nội suy

https://vanchanh123.wordpress.com/2014/11/25/van-de-noi-suy-2/

 

 

—–

Linh tinh

A system is a big black box
Of which we can’t unlock the locks,
And all we can find out about
Is what goes in and what comes out.
—Kenneth Boulding

2 Responses to “Một số kết quả đáng quan tâm”

  1. vanchanh123 Says:

    Chúng ta thử liên tưởng kết quả trên với qui tắc dấu Descart?

  2. vanchanh123 Says:

    Thêm 1 kết quả về điểm bất động:
    Perov’s fixed point theorem http://www.mathvn.org/forum/viewthread.php?thread_id=1135&pid=4851


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