Question on dynamical system

zetafunction

I have some questions about dynamical system

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

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

the work by Deninguer can be foud here:

http://www.google.es/url?sa=t&source...zhpxsSWMPTS0ew