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Well-posedness for degenerate third order equations with delay and applications to inverse problems
Springer (2018-10)In this paper, we study well-posedness for the following third-order in time equation with delay (0.1)α(Mu′)′′(t)+(Nu′)′(t)=βAu(t)+γBu′(t)+Gu′t+Fut+f(t),t∈[0,2π] where α, β, γ are real numbers, A and B are linear operators ... -
Written on stone: Engraved European medieval solar eclipses
Cambridge University Press (2019-12)In the context of the European Middle Ages as the period roughly covering from the 5th to the 15th centuries, the astronomical records are rarery found in scientific treatises. At least, not until the 15th century. A few ...