与Bernoulli双纽线相关的星形函数的充分条件
Sufficient Conditions for Starlike Functions Associated with the Lemniscate of Bernoulli
摘要:
设-1\f2 \leq B<A \leq 1。确定β的条件,使得1+β zp ′(z)/p^k(z)\prec(1+Az)/(1+Bz)|(-1 ≤ k \leq 3)隐含p(z)\prec \sqrt{1+z}。类似地,确定β上的条件,使得1+β zp '(z)/p^n(z)或p(z)+β zp'(z)/p^n(z)\prec \sqrt{1+z} \;(n=0,1,2)意味着p(z)\prec(1+Az)/(1+Bz)或\sqrt{1+z}。除此之外,还导出了β的条件,使得当p(z)+β zp '(z)/p(z)\prec \sqrt{1+z}时,p(z)\prec(1+Az)/(1+Bz).还考虑了类似的问题。
英文摘要:
Let -1\leq B<A\leq 1. Condition on β, is determined so that 1+βzp'(z)/p^k(z)\prec(1+Az)/(1+Bz)\;(-1<k\leq3) implies p(z)\prec \sqrt{1+z}. Similarly, condition on βis determined so that 1+βzp'(z)/p^n(z) or p(z)+βzp'(z)/p^n(z)\prec\sqrt{1+z}\;(n=0, 1, 2) implies p(z)\prec(1+Az)/(1+Bz) or \sqrt{1+z}. In addition to that condition on βis derived so that p(z)\prec(1+Az)/(1+Bz) when p(z)+βzp'(z)/p(z)\prec\sqrt{1+z}. Few more problems of the similar flavor are also considered.
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