QUANTUM MECHANICS IS EITHER NONLINEAR OR NON-INTROSPECTIVE

The measurement conundrum seems to have plagued quantum mechanics for so long that impressions of an inconsistency amongst its axioms have spawned. A demonstration that such purported inconsistency is fictitious may then be in order and is presented here. An exclusion principle of sorts emerges, stating that quantum mechanics cannot be simultaneously linear and introspective (self-observing). The nonlinearity of this latter approach allows quantum mechanics to describe the entire measuring process, and also to be applied to the entire universe, for which there is no external observer.