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theorems:stone-von_neumann [2018/05/02 09:11] jakobadmin [Intuitive] |
theorems:stone-von_neumann [2018/07/18 13:24] jakobadmin [Intuitive] |
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<tabbox Intuitive> | <tabbox Intuitive> | ||
+ | <blockquote>The Stone-von Neumann theorem roughly says that for any operators $A$ and $B$ satisfying the canonical commutation relation, we can get away with using the standard representation $A \rightarrow u,\ B \rightarrow -i \hbar \frac{d}{du}$ without loss of generality. (More precisely, it says that any representation of the *exponentiated* canonical commutation relation on a sufficiently smooth Hilbert space is unitarily equivalent to the standard representation, so any other representation basically just describes the same physics in a different coordinate system.)<cite>https://physics.stackexchange.com/a/264587/37286</cite></blockquote> | ||
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<blockquote>In typical physics quantum mechanics textbooks, one often sees calculations | <blockquote>In typical physics quantum mechanics textbooks, one often sees calculations | ||
- | made just using the [[equations:canonical_commutation_relations|Heisenberg commutation relations]], without picking a specific | + | made just using the [[formulas:canonical_commutation_relations|Heisenberg commutation relations]], without picking a specific |
representation of the operators that satisfy these relations. This turns out | representation of the operators that satisfy these relations. This turns out | ||
to be justified by the remarkable fact that, for the Heisenberg group, once one | to be justified by the remarkable fact that, for the Heisenberg group, once one |