How Long Can A Pencil Remain Balanced On Its Tip?
... Imagine that a pencil has been successfully balanced on its tip in the vertical position. Imagine also that it is entirely free from disturbances. Thus, all vibrations are rigorously excluded from the table on which the pencil stands. Likewise, not the slightest breath of air is permitted to disturb ...
... Imagine that a pencil has been successfully balanced on its tip in the vertical position. Imagine also that it is entirely free from disturbances. Thus, all vibrations are rigorously excluded from the table on which the pencil stands. Likewise, not the slightest breath of air is permitted to disturb ...
Two constructions of quantum graphs and two types of
... matrix. We describe the above constructions in more detail in Section 2. A simple but important question is whether the two constructions are fully analogous. A straightforward observation is that most authors, when using the scattering approach, consider only λ-independent (energy-independent) matr ...
... matrix. We describe the above constructions in more detail in Section 2. A simple but important question is whether the two constructions are fully analogous. A straightforward observation is that most authors, when using the scattering approach, consider only λ-independent (energy-independent) matr ...
