Contents Online

# Advances in Theoretical and Mathematical Physics

## Volume 24 (2020)

### Number 4

### Contents

On the counting of $O(N)$ tensor invariants

pp. 821-878

Symplectic coarse-grained dynamics: Chalkboard motion in classical and quantum mechanics

pp. 925-977

Coupled gravitational and electromagnetic perturbations of Reissner–Nordström spacetime in a polarized setting

pp. 979-1025

Nilmanifolds and their associated non-local fields

pp. 1027-1053