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Spectral properties of general advection operators and weighted translation semigroups
The number of limit cycles for generalized Abel equations with periodic coefficients of definite sign
1. | Departamento de Matemáticas, Universidad de Extremadura, Badajoz, 06071, Spain, Spain, Spain |
  We obtain examples with at least seven limit cycles, and some sufficient conditions for the equation to have at most one or at most two positive limit cycles.
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