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Could you please explain or give some resources about the symbol "line" on the head of the function

Muhammed Samedzade
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    Depending on the context, it could mean almost anything. Try to find it in the book, surely they explain it there. – Matti P. May 18 '20 at 09:36

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It is the symbol of conjugation meaning here that the matrix of inverse Discrete Fourier Transform (DFT) is (up to a multiplicative constant) the conjugate of the direct DFT matrix.

See for example this

Jean Marie
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