• From: Dave Pawson <dave.pawson@g...>
• To: Roger L Costello <costello@m...>
• Date: Wed, 2 Mar 2022 14:59:38 +0000

On Wed, 2 Mar 2022 at 14:39, Roger L Costello <costello@m...> 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
XSLT XSL-FO FAQ.
Docbook FAQ.

• Follow-Ups:
  • Re: Language design, orthogonality, paternalism, bad rules,and elephant traps
    • From: Michael Kay <mike@s...>

• References:
  • Language design, orthogonality, paternalism, bad rules, and elephanttraps
    • From: Roger L Costello <costello@m...>