LA 错题笔记

  1. AB = 0
    https://math.stackexchange.com/questions/783593/showing-ab-0-does-not-imply-either-a-b-0-but-that-singular
    "No need for a contradiction."
    Matrix C is singular,
    iff for nonzero x:
    Cx = 0.

  2. closest function
    and Fourier series.

  3. transformation matrix based on a given basis

  4. how the linear transformation works

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