query: Why do we derive more fundamental quantum theories from less fundamental classical theories?
positive_passages.docid: 139993
positive_passages.text: Quantum systems without a classical analogue?
negative_passages.docid: 38359
negative_passages.text: How can one derive Schrödinger equation?
negative_passages.docid: 37742
negative_passages.text: What combinations of realism, non-locality, and contextuality are ruled out in quantum theory?
negative_passages.docid: 70281
negative_passages.text: Why does non-commutativity in quantum mechanics require us to use Hilbert spaces?
negative_passages.docid: 50178
negative_passages.text: \qed for theorems without proofs
negative_passages.docid: 101090
negative_passages.text: Why exactly do sometimes universal covers, and sometimes central extensions feature in the application of a symmetry group to quantum physics?
negative_passages.docid: 10504
negative_passages.text: What are the reasons to expect that gravity should be quantized?
negative_passages.docid: 109411
negative_passages.text: Does the new finding on "reversing a quantum jump mid-flight" rule out any interpretations of QM?
negative_passages.docid: 113472
negative_passages.text: Quantum mechanics and everyday nature
negative_passages.docid: 80573
negative_passages.text: Nature of the quantum degeneracy pressure
negative_passages.docid: 87423
negative_passages.text: Why can we treat quantum scattering problems as time-independent?
negative_passages.docid: 61605
negative_passages.text: Advantages of using different metric signatures in relativity and QFT
negative_passages.docid: 155176
negative_passages.text: Tensor product vs. Cartesian Product for composite quantum systems
negative_passages.docid: 99695
negative_passages.text: How does non-commutativity lead to uncertainty?
negative_passages.docid: 95368
negative_passages.text: Is it possible for more than two particles to be entangled in a quantum way?
negative_passages.docid: 134164
negative_passages.text: What is wrong with the De Broglie–Bohm theory a.k.a "Causal Interpretation" of quantum theory?
negative_passages.docid: 45559
negative_passages.text: Why we use $L_2$ Space In QM?