^{*}

^{*}

^{*}

In the present article, certain classes of generalized p-valent Robertson functions are considered. Mapping properties of these classes are investigated under certain p-valent integral operators introduced by Frasin recently.

Let be the class of functions of the form

which are analytic in the open unit disc. We write. A function is said to be spiral-like if there exists a real number

such that

The class of all spiral-like functions was introduced by L. Spacek [

Let be the class of functions analytic in with and

where, and is real with.

For, , this class was introduced in [

We define the following classes

For, and, we obtain the well known classes and of analytic functions with bounded radius and bounded boundary rotations studied by Tammi [

Let us consider the integral operators

and

where and for all .

These operators, given by (1.1) and (1.2), are defined by Frasin [

and for, , in (1.2), we obtain the integral operator

discussed in [22,23].

In this paper, we investigate some propeties of the above integral operators and for the classes and respectively.

Theorem 2.1. Let for with

. Also let is real with, ,

. If

then with

Proof. From (1.1), we have

or, equivalently

Subtracting and adding on the right hand side of (2.3), we have

Taking real part of (2.4) and then simple computation gives

where is given by (2.1). Since for, we have

Using (2.6) and (2.1) in (2.5), we obtain

Hence with is given by (2.1).

By setting and in Theorem 2.1, we obtain the following result proved in [

Corollory 2.2. Let for with. Also let,. If

then and is given by (2.1).

Now if we take and in Theorem 2.1, we obtain the following result.

Corollory 2.3. Let for with. Also let,. If

then and is given by (2.1).

Letting, , and in Theorem 2.1, we have.

Corollory 2.4. Let with. Also let. If

then

with.

Theorem 2.5. Let for

with. Also let is real is real with,

,. If

then and is given by (2.1).

Proof. From (1.2), we have

or, equivalently

This relation is equivalent to

Taking real part of (2.7) and then simple computation gives us

where is given by (2.1). Since for, we have

Using (2.9) in (2.8), we obtain

Hence with is given by (2.1).

By setting and in Theorem 2.5, we obtain the following result.

Corollory 2.6. Let for with. Also let,. If

then with is given by (2.1).

Letting, , and in Theorem 2.5, we have.

Corollory 2.7. Let with. Also let. If, then

with.