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physics.optics2026
Obituary for Augustin Fresnel
Alphonse Duleau, Gavin R. Putland
Annotated English translation of Duleau's "Notice sur A. Fresnel" in Revue encyclopédique, vol.39, pp.558-67 (September 1828), and of the shorter obituary for Fresnel in id., vol.3…
physics.optics2025
Exact formulation of Huygens' principle in terms of generalized spatiotemporal-dipole secondary sources
Gavin R. Putland
A "spatiotemporal dipole" wave source, as defined by D.A.B. Miller (1991), differs from an ordinary ("spatial") dipole source in that the inverted monopole is delayed relative to t…