On Wed, 2 Mar 2022 at 14:39, Roger L Costello <> wrote:
> The answer is orthogonality. Michael Kay explains:
>
> “Orthogonality (or, "no needless restrictions")
adjective
Mathematics.
Also orthographic. pertaining to or involving right angles or
perpendiculars:an orthogonal projection.
(of a system of real functions) defined so that the integral of the
product of any two different functions is zero.
(of a system of complex functions) defined so that the integral of the
product of a function times the complex conjugate of any other
function equals zero.
(of two vectors) having an inner product equal to zero.
(of a linear transformation) defined so that the length of a vector
under the transformation equals the length of the original vector.
(of a square matrix) defined so that its product with its transpose
results in the identity matrix.
Mike?
--
Dave Pawson
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