Could you please explain or give some resources about the symbol "line" on the head of the function
2026-03-30 09:52:31.1774864351
What is the meaning of this symbol
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1
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