Ciro Santilli
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Linear map (linear operator) | 🗖 nosplit | ↑ parent "Matrix multiplication" | 56, 2, 69

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Basically a generalization of a matrix, notably to infinite dimensional spaces like Hilbert space.
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Calling such functions matrices is stretching it a bit, since we would need to specify infinitely many rows and columns.
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For example, the left side of the time-independent Schrodinger equation is a linear map.
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