该文引入一个新的解析函数类Hk(β),对f(z)∈HK(β),f(z)=z+a2z2+a3z3+…,μ为任意的实参数,得到了|a3-μa22|的准确上界.
In this paper, a new class Hk(β) of analytic function is introduced. Letf(z) ∈ Hk(β) withf(z) = z +a2z^2 + a3z^3 +… . Sharp bounds are obtained for | a3 - ua2^2 | , where u is real.