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The interplay of paramagnetism, zero modes of the Dirac operator andfermionic mass singularities on the fermionic determinants in quantumelectrodynamics in two, three and four dimensions is discussed.Comment: 13 pages, uses latex2e+amste

Paramagnetism, zero modes, and mass singularities in QED in 1+1, 2+1, and 3+1 dimensions