## Question on dynamical system

I have some questions about dynamical system

- What do you call a 'flow' ?? , are you referring to the operator $$\sigma ^{t} =e^{itH}$$ with 'H' being a Hamiltonian operator

- In Deninger paper (see link below) it appears the definition 'Let be $$R_{p}$$ the R-vector space of real valued finite Fourier series on $$R/(logp)Z$$ , what is exactly the definition of the quotient space $$R/(logp)Z$$

the work by Deninguer can be foud here: