Comment by _wire_

This article wastes readers' time by pretending to command of a subject in a manner that is authoritative only in its uncertainty.

Pixel is an abbreviation for 'picture element' which describes a unit of electronic image representation. To understand it, consider picture elements in the following context...

(Insert X different ways of thinking about pictures and their elements.)

If there is a need for a jargon of mathematical "dimensionality" for any of these ways of thinking, please discuss it in such context.

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<i>A musical note is a unit of...</i>