FOCAL SURFACES OF WAVE FRONTS IN THE EUCLIDEAN 3-SPACE
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DOI: 10.1017/s0017089518000277
Abstract: Abstract We characterise singularities of focal surfaces of wave fronts in terms of differential geometric properties of the initial wave fronts. Moreover, we study relationships between geometric properties of focal surfaces and geometric invariants of… read more here.
Keywords: focal surfaces; fronts euclidean; euclidean space; surfaces wave ... See more keywords