QED in strong, finite-flux magnetic fields.

Lower bounds are placed on the fermionic determinants of Euclidean quantum electrodynamics in two and four dimensions in the presence of a smooth, finite-flux, static, unidirectional magnetic field B(r)=(0,0,B(r)), where B(r)\ensuremath{\ge}0 or B(r)\ensuremath{\le}0, and r is a point in the xy plane. \textcopyright{} 1996 The American Physical Society.