"Non-strict" l'Hospital-Type Rules for Monotonicity: Intervals of Constancy

Details "Non-strict" l'Hospital-Type Rules for Monotonicity: Intervals of Constancy "Non-strict" l'Hospital-Type Rules for Monotonicity: Intervals of Constancy

2006-11-21

arxiv.org/abs/math/0611662v1

Mathematics

Classical Analysis and ODEs

5 pages

Scientific paper

Assuming that a "derivative" ratio rho:=f'/g' of the ratio r:=f/g of differentiable functions f and g is strictly monotonic (that is, rho is increasing or decreasing), it was shown in previous papers that then r can switch at most once, from decrease to increase or vice versa. In the present paper, it is shown that, if rho is non-strictly monotonic (that is, non-increasing or non-decreasing), then r can have at most one maximal interval of constancy (m.i.c.); on the other hand, any one m.i.c. of a given derivative ratio rho is the m.i.c. of an appropriately constructed original ratio r.

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