Revisiting the Algebraic and Analytic Descriptions of Quantum Mechanics

Abstract

Quantum mechanics was initially conceptualized within the infinite-dimensional sequence space l2 by Born, Heisenberg, and Jordan, relying on the canonical commutation relation. However, as formalized by the Wintner-Wielandt theorem, this relation cannot hold universally using bounded, everywhere-defined operators. To prevent algebraic collapse, a structural restriction becomes inevitable, revealing a profound logical dichotomy. The traditional analytical approach, formalized by von Neumann, circumvents the Wintner prohibition to secure exact invariance of the relation, but abandons the Hilbert space framework for the non-normed Schwartz space and its dual distribution space. Conversely, the algebraic approach accepts the Wintner constraint as a structural law; it preserves the strict Hilbert space structure by accepting a boundary modification of the commutation relation within a finite, yet arbitrarily large dimension C(N+1) . This autonomous path directly yields a new physical observable, defined as the action difference D . While empirical correspondence holds perfectly within the interior matrix space, only this algebraic framework unlocks manageable eigenvectors for both position and momentum. Within this formulation, we rigorously prove that all position eigenvectors possess non-negligible components extending up to the highest energy levels. Confronted with this spectrum during a position measurement, a finite observer can resolve only a bounded energy spectrum, causing the accessible information to shrink to a set of measure zero. Consequently, quantum randomness emerges as intrinsic decoherence at the interface between the finite observation window and the space. Furthermore, we can demonstrate that the algebraic representation provides the foundational, contradiction-free justification for the continuous Cauchy-Hilbert core.