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On deviations from rational functions of entire functions of finite lower order

E. CiechanowiczI. I. Marchenko — 2007

Annales Polonici Mathematici

Let f be a transcendental entire function of finite lower order, and let q ν be rational functions. For 0 < γ < ∞ let B(γ):= πγ/sinπγ if γ ≤ 0.5, B(γ):= πγ if γ > 0.5. We estimate the upper and lower logarithmic density of the set r : 1 ν k l o g m a x | | z | | = r | f ( z ) q ν ( z ) | 1 < B ( γ ) T ( r , f ) .

On strong tracts of subharmonic functions of infinite lower order

I. I. MarchenkoA. Szkibiel — 2007

Annales Polonici Mathematici

The notion of a strong asymptotic tract for subharmonic functions is defined. Eremenko's value b(∞,u) for subharmonic functions is introduced and it is used to provide an exact upper estimate of the number of strong tracts of subharmonic functions of infinite lower order. It is also shown that b(∞,u) ≤ π for subharmonic functions of infinite lower order.

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