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math.CA2022★ 2 cited
An antimaximum principle for periodic solutions of a forced oscillator
Alain Albouy, Antonio J. Ureña
Consider the equation of the linear oscillator , where the forcing term is -periodic and positive. We show that the existence of a periodic…
math.CA2013★ 15 cited
Some remarks about Descartes' rule of signs
Alain Albouy, Yanning Fu
What can we deduce about the roots of a real polynomial in one variable by simply considering the signs of its coefficients? On one hand, we give a complete answer concerning the p…