Paramagnetism, zero modes and mass singularities in QED in $1+1$, $2+1$   and $3+1$ dimensions
  The interplay of paramagnetism, zero modes of the Dirac operator and fermionic mass singularities on the fermionic determinants in quantum electrodynamics in two, three and four dimensions is discussed. 
M. P. Fry (School of Mathematics, Trinity College, Dublin)