ABSTRACT
(1) Regress involves a series of steps “backwards” to what has gone before, in any of the various senses of precedence. (2) A process of regression can accordingly take many different forms. (3) Regresses can be finite or endless. (4) Regresses can be linear or circular or branched. (5) The theory of regression has a characteristic terminology. (6) The progresses that have figured prominently in the literature are generally ones engendered by recursive rules that render them substantially homogenous.
