A recent proof, couched in the symbolic language of modal logic, shows that a well-defined formulation of the question posed in the title is answered affirmatively. In a paper with the same title Unruh has tried in various ways to translate the symbolic proof into normal prose, and has claimed that the proof must fail in some way or another. A correct translation is given here, and it is explai...

We demonstrate how to construct a lorentz-invariant, hidden-variable interpretation of relativistic quantum mechanics based on particle trajectories. The covariant theory that we propose employs a multi-time formalism and a lorentz-invariant rule for the coordination of the space-time points on the individual particle trajectories. In this way we show that there is no contradiction between nonl...

In this study, using the non-local elasticity theory, the buckling and vibration analysis of triple- walled ZnO piezoelectric Timoshenko beam on elastic Pasternak foundation is analytically investigated under magneto-electro-thermo-mechanical loadings. Using the Timoshenko beam free body diagram, the equilibrium equation of Timoshenko nano-beam model is obtained and solved by Navier’s method fo...

We prove the boundedness of non-local operator $$\begin{aligned} \mathcal {L}^a u(x)=\int _{\mathbb {R}^d} \left( u(x+y)-u(x)-\chi _\alpha (y)\big (\nabla u(x),y\big )\right) a(x,y)\frac{dy}{|y|^{d+\alpha }} \end{aligned}$$ from $$H_{p,w}^\alpha (\mathbb {R}^d)$$ to $$L_{p,w}(\mathbb for whole range $$p \in (1,\infty )$$ , where w is a Muckenhoupt weight. The coefficient a(x, y) bounded, merely...