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Au dips, on peut resserrer la prise ou au contraire l'élargir, on peut jouer aussi sur les amplitudes :
Larger amplitudes will have a greater impact (45, 99) (Figure 2).
The constant pressure amplitudes across the 1cm sealed tube length, given in Figure 3 are quite similar to the pressures in the trapped volume of the ear canal calculated for a much more involved model taking into account the compliances and motions of the structures of the middle ear (tympanic membrane, etc.).
An important aspect of topological field theories is that the quantum amplitude for time evolution is invariant under diffeomorphism - therefore, we can take the cylinder M × I to represent the “identity map.” On the other hand, the quantum nature of the system allows for “quantum fusion” and “quantum splitting,” the amplitudes for which are described by bordisms M → N .