SOME INCLUSION RELATIONSHIPS FOR CERTAIN SUBCLASSES OF MEROMORPHIC FUNCTIONS ASSOCIATED WITH A FAMILY OF INTEGRAL OPERATORS. f(z) = 1 z + a k z k,
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1 Acta Math. Univ. Comenianae Vol. LXXVIII, 2(2009), pp SOME INCLUSION RELATIONSHIPS FOR CERTAIN SUBCLASSES OF MEROMORPHIC FUNCTIONS ASSOCIATED WITH A FAMILY OF INTEGRAL OPERATORS C. SELVARAJ and K. R. KARTHIKEYAN Abstract. We define a family of integral operators using multiplier transformation on the space of normalized meromorphic functions and introduce several new subclasses using this operator. We investigate various inclusion relations for these subclasses and some interesting applications involving a certain class of the integral operator are also considered. 1. Introduction, Definitions And Preliminaries Let M denote the class of functions of the form (1) f(z) = 1 z + a k z k, k=0 which are analytic in the punctured open unit disk U = {z : z C and 0 < z < 1} = U \ {0}. A function f M is said to be in the class MS (γ) of meromorphic starlike functions of order γ in U if and only if ( ) zf (z) (2) Re < γ (z U; 0 γ < 1). f(z) A function f M is said to be in the class MC(γ) of meromorphic convex functions of order γ in U if and only if ) zf (z) (3) Re (1 + < γ (z U; 0 γ < 1). f (z) We now define a subclass of meromorphic close-to-convex functions of order δ type γ as follows. A function f M is said to be in the class C (δ, γ) if there Received May 24, Mathematics Subject Classification. Primary 30C45, 30C60. Key words and phrases. Meromorphic functions; Hadamard product; generalized hypergeometric functions; linear operators.
2 246 C. SELVARAJ and K. R. KARTHIKEYAN exists a function g(z) MC(γ) such that ( ) zf (z) (4) Re < δ (z U; 0 γ < 1; 0 δ < 1). g(z) Similarly, a function f M is said to be in the class K(δ, γ) if there exists a function g(z) MC(γ) such that ( ) z(zf (z)) (5) Re < δ (z U; 0 γ < 1; 0 δ < 1). g(z) In recent years, several families of integral operators and differential operators were introduced using Hadamard product (or convolution). For example, we choose to mention the Ruscheweyh derivative [11], the Carlson-Shaffer operator [1], the Dziok-Srivastava operator [2], the Noor integral operator [9] and so on (see[3, 5, 8, 10]). Motivated by the work of N. E. Cho and K. I. Noor [7], we introduce a family of integral operators defined on the space meromorphic functions in the class M. By using these integral operators, we define several subclasses of meromorphic functions and investigate various inclusion relationships and integral preserving properties for the meromorphic function classes introduced here. For complex parameters α 1,..., α q and β 1,..., β s (β j C \ Z 0 ; Z 0 = 0, 1, 2,... ; j = 1,..., s), we define the function φ(α 1, α 2,..., α q, β 1, β 2,..., β s ; z) by φ(α 1, α 2,..., α q, β 1, β 2,..., β s ; z) := 1 z + k=0 (q s + 1; q, s N 0 := N {0}; z U), (α 1 ) k+1 (α 2 ) k+1... (α q ) k+1 z k (β 1 ) k+1 (β 2 ) k+1... (β s ) k+1 (k + 1)! where (x) k is the Pochhammer symbol defined by { 1 if k = 0 (x) k = x(x + 1)(x + 2)... (x + k 1) if k N 0 = {1, 2,,...}. Now we introduce the following operator Iµ(α p 1, α 2,..., α q, β 1, β 2,..., β s ): M M as follows: ( ) Let F µ, p (z) = 1 z + p k + µ + 1 z k, p N 0, µ 0 and let Fµ, 1 k=0 µ p(z) be defined such that Then (6) (7) F µ, p (z) F 1 µ, p(z) = φ(α 1, α 2,..., α q, β 1, β 2,..., β s ; z). I p µ(α 1, α 2,..., α q, β 1, β 2,..., β s )f = F 1 µ, p(z) f(z). From (6) it can be easily seen that Iµ(α p 1, α 2,..., α q, β 1, β 2,..., β s )f = 1 z + ( ) p µ (α 1 ) k+1 (α 2 ) k+1... (α q ) k+1 z k k + µ + 1 (β 1 ) k+1 (β 2 ) k+1... (β s ) k+1 (k + 1)!. k=0
3 SOME INCLUSION RELATIONSHIPS FOR CERTAIN SUBCLASSES 247 For convenience, we shall henceforth denote (8) I p µ(α 1, α 2,..., α q, β 1, β 2,..., β s )f = I p µ(α 1, β 1 )f. For the choice of the parameters p = 0, q = 2, s = 1, the operator I p µ(α 1, β 1 )f is reduced to an operator introduced by N. E. Cho and K. I. Noor in [7] and when p = 0, q = 2, s = 1, α 1 = λ, α 2 = 1, β 1 = (n + 1), the operator I p µ(α 1, β 1 )f is reduced to an operator recently introduced by S.-M. Yuan et. al. in [12]. It can be easily verified from the above definition of the operator I p µ(α 1, β 1 )f that (9) z(i p+1 µ (α 1, β 1 )f(z)) = µi p µ(α 1, β 1 )f(z) (µ + 1)I p+1 µ (α 1, β 1 )f(z) and (10) z(iµ(α p 1, β 1 )f(z)) = α 1 Iµ(α p 1 + 1, β 1 )f(z) (α 1 + 1)Iµ(α p 1, β 1 )f(z). By using the operator I p µ(α 1, β 1 )f, we now introduce the following subclasses of meromorphic functions: and We note that MS p µ(α 1, β 1, γ) := { f : f M and I p µ(α 1, β 1 )f MS (γ) }, MC p µ(α 1, β 1, γ) := { f : f M and I p µ(α 1, β 1 )f MC(γ) }, QC p µ(α 1, β 1, γ, δ) := { f : f M and I p µ(α 1, β 1 )f C (δ, γ) } QK p µ(α 1, β 1, γ, δ) := { f : f M and I p µ(α 1, β 1 )f K(δ, γ) }. (11) f(z) MC p µ(α 1, β 1, γ) zf (z) MS p µ(α 1, β 1, γ) and a similar relationship exists between the classes QC p µ(α 1, β 1, γ, δ) and QK p µ(α 1, β 1, γ, δ). In order to establish our main results, we need the following lemma which is popularly known as the Miller-Mocanu Lemma. Lemma 1.1 ([6]). Let u = u 1 + i u 2, v = v 1 + i v 2 and let ψ(u, v) be a complex function, ψ : D C, D C C. Suppose that ψ satisfies the following conditions (i) ψ(u, v) is continuous in D; (ii) (1, 0) D and Re{ψ(1, 0)} > 0; (iii) Re{ψ(i u 2, v 1 )} 0 for all (i u 2, v 1 ) D and such that v 1 (1+u2 2 ) 2. Let p(z) = 1 + p 1 z + p 2 z 2 + p 3 z 3 be analytic in E, such that (p(z), zp (z)) D for all z U. If Re{ψ(p(z), zp (z))} > 0 (z U), then Re(p(z)) > 0 for z U.
4 248 C. SELVARAJ and K. R. KARTHIKEYAN 2. Main Results In this section, we give several inclusion relationships for meromorphic function classes, which are associated with the integral operator I p µ(α 1, β 1 )f. Theorem 2.1. Let α 1, µ > 0 and 0 γ < 1. Then MS p µ(α 1 + 1, β 1, γ) MS p µ(α 1, β 1, γ) MS p+1 µ (α 1, β 1, γ). Proof. To prove the first part of Theorem 2.1, let f MS p µ(α 1 + 1, β 1, γ) and set (12) z(i p µ(α 1, β 1 )f(z)) I p µ(α 1, β 1 )f(z) + γ = (1 γ)p(z) where p(z) = 1 + p 1 z + p 2 z is analytic in U and p(z) 0 for all z U. Then by applying the identity (10), we obtain (13) α 1 I p µ(α 1 + 1, β 1 )f(z) I p µ(α 1, β 1 )f(z) = z(ip µ(α 1, β 1 )f(z)) Iµ(α p + (α 1 + 1) 1, β 1 )f(z) = (1 γ)p(z) γ + (α 1 + 1). By logarithmically differentiating both sides of the equation (13), we get z(i p µ(α 1 + 1, β 1 )f(z)) I p µ(α 1 + 1, β 1 )f(z) = z(ip µ(α 1, β 1 )f(z)) I p µ(α 1, β 1 )f(z) = γ (1 γ)p(z) + + (1 γ)zp (z) (1 γ)p(z) + γ (α 1 + 1) (1 γ)zp (z) (1 γ)p(z) + γ (α 1 + 1). Now we form the equation ψ(u, v) by choosing u = p(z) = u 1 +i u 2, v = zp (z) = v 1 + i v 2, (14) ψ(u, v) = (1 γ)u (1 γ)v (1 γ)u + γ (α 1 + 1). Then clearly, ψ(u, v) is continuous in ( { }) α1 + 1 γ D = C \ C 1 γ and (1, 0) D with Re ( ψ(1, 0) ) > 0. Moreover, for all (i u 2, v 1 ) D such that v (1 + u2 2), we have { } (1 γ)v 1 Re ψ(i u 2, v 1 ) = Re (1 γ) i u 2 + γ (α 1 + 1) (1 γ)(1 + u2 2)(α γ) 2[(γ 1 α 1 ) 2 + (1 γ) 2 u 2 2 ] < 0. = (1 γ)(α γ)v 1 (γ α 1 1) 2 + (1 γ) 2 u 2 2
5 SOME INCLUSION RELATIONSHIPS FOR CERTAIN SUBCLASSES 249 Therefore ψ(u, v) satisfies the hypothesis of the Miller-Mocanu Lemma. This shows that if Re ψ(p(z), zp (z)) > 0 (z U), then Re(p(z)) > 0 (z U), that is if f(z) MS p µ(α 1 + 1, β 1, γ) then f(z) MS p µ(α 1, β 1, γ). To prove the second inclusion relationship asserted by Theorem 2.1, let f MS p µ(α 1, β 1, γ) and put (15) (1 γ)s(z) = γ + z(ip+1 µ (α 1, β 1 )f(z)) Iµ p+1 (α 1, β 1 )f(z) where the function s(z) is analytic in U with s(0) = 1. Then using the arguments to those detailed above with (9), it follows that MS p µ(α 1, β 1, γ) MS p+1 µ (α 1, β 1, γ), which completes the proof of the Theorem 2.1. and Theorem 2.2. Let α 1, µ > 0 and 0 γ < 1. Then MC p µ(α 1 + 1, β 1, γ) MC p µ(α 1, β 1, γ) MS p+1 µ (α 1, β 1, γ). Proof. We observe that f(z) MC p µ(α 1 + 1, β 1, γ) I p µ(α 1 + 1, β 1 )f(z) MC(γ) z(i p µ(α 1 + 1, β 1 )f(z)) MS (γ) I p µ(α 1 + 1, β 1 )( zf (z)) MS (γ) zf (z) MS p µ(α 1 + 1, β 1, γ) = zf (z) MS p µ(α 1, β 1, γ) I p µ(α 1, β 1 )( zf(z)) MS (γ) z(i p µ(α 1, β 1 )f(z)) MS (γ) I p µ(α 1, β 1 ) MC(γ) f(z) MC p µ(α 1, β 1, γ) f(z) MC p µ(α 1, β 1, γ) zf (z) MS p µ(α 1, β 1, γ) which evidently proves Theorem 2.2. = zf (z) MS p+1 µ (α 1, β 1, γ) z(i p+1 µ (α 1, β 1 )f(z)) MS (γ) f(z) MC p+1 µ (α 1, β 1, γ) Theorem 2.3. Let α 1, µ > 0 and 0 γ, δ < 1. Then QC p µ(α 1 + 1, β 1, γ, δ) QC p µ(α 1, β 1, γ, δ) QC p+1 µ (α 1, β 1, γ, δ). Proof. We begin proving that QC p µ(α 1 + 1, β 1, γ, δ) QC p µ(α 1, β 1, γ, δ).
6 250 C. SELVARAJ and K. R. KARTHIKEYAN Let f(z) QC p µ(α 1 + 1, β 1, γ, δ). Then, in view of the definition of the function class QC p µ(α 1 + 1, β 1, γ, δ), there exists a function q MC(γ) such that ( z(i p µ (α 1 + 1, β 1 )f(z)) ) Re < δ. q(z) Choose the function g(z) such that q(z) = Iµ(α p 1 + 1, β 1 )g(z), then ( z(i p g MC p µ (α 1 + 1, β 1 )f(z)) ) (16) µ(α 1 + 1, β 1, γ) and Re Iµ(α p < δ , β 1 )g(z) We next put (17) z(i p µ(α 1, β 1 )f(z)) I p µ(α 1, β 1 )g(z) + δ = (1 δ)p(z), where p(z) = 1 + c 1 z + c 2 z is analytic in U and p(z) 0 for all z U. Thus, by using the identity (10), we have (18) z(iµ(α p 1 + 1, β 1 )f(z)) I p µ(α 1 + 1, β 1 )g(z) = Ip µ(α 1 + 1, β 1 )(zf (z)) I p µ(α 1 + 1, β 1 )g(z) = z[ip µ(α 1, β 1 )(zf (z))] + (α 1 + 1)I p µ(α 1, β 1 )(zf (z)) z(i p µ(α 1, β 1 )g(z)) + (α 1 + 1)I p µ(α 1, β 1 )g(z) = z[iµ(α p 1,β 1 )(zf (z))] Iµ(α p 1,β 1 )g(z) z(iµ(α p 1,β 1 )g(z)) + Iµ(α p +(α 1 +1) 1,β 1 )g(z) (α 1 +1)Iµ(α p 1,β 1 )(zf (z)) Iµ(α p 1,β 1 )g(z) z(iµ(α p 1,β 1 )g(z)). Iµ(α p +(α 1 +1) 1,β 1 )g(z) Jack [4] showed that g MC(γ) implies that g MS (σ) where σ = 2γ γ + 4γ 2. 4 Since g(z) MC p µ(α 1 + 1, β 1, γ) and MC p µ(α 1 + 1, β 1, γ) MC p µ(α 1, β 1, γ), for some σ we can set z(iµ(α p 1, β 1 )g(z)) Iµ(α p + σ = (1 σ)h(z) 1, β 1 )g(z) where H(z) = h 1 (x, y) + i h 2 (x, y) and Re ( H(z) ) = h 1 (x, y) > 0, (z U). Then (19) z(iµ(α p 1 + 1, β 1 )f(z)) Iµ(α p = 1 + 1, β 1 )g(z) z[i p µ(α 1, β 1 )(zf (z))] I p µ(α 1, β 1 )g(z) σ (1 σ)h(z) + (α 1 + 1) (α 1 + 1) [ δ + (1 δ)p(z) ] σ (1 σ)h(z) + (α 1 + 1).
7 SOME INCLUSION RELATIONSHIPS FOR CERTAIN SUBCLASSES 251 We thus find from (17) that (20) z(i p µ(α 1, β 1 )f(z)) = I p µ(α 1, β 1 )g(z) [ δ + (1 δ)p(z) ]. Upon differentiating both sides of (20) with respect to z, we have (21) z [ z(iµ(α p 1, β 1 )f(z)) ] Iµ(α p = (1 δ)zp (z) 1, β 1 )g(z) + [ σ + (1 σ)h(z) ][ δ + (1 δ)p(z) ]. By substituting (21) in (19), we obtain z(iµ(α p 1 + 1, β 1 )f(z)) { (1 δ)zp } (z) Iµ(α p + δ = (1 δ)p(z) , β 1 )g(z) σ + (1 σ)h(z) (α 1 + 1) We now choose u = p(z) = u 1 + i u 2 and v = zp (z) = v 1 + i v 2, we define the function ψ(u, v) by (22) ψ(u, v) = (1 δ)u (1 δ)v σ + (1 σ)h(z) (α 1 + 1) where (u, v) D = (C \ D ) C and { D = z : z C and Re(H(z)) = h 1 (z) 1 + α } 1. 1 σ It is easy to see that ψ(u, v) is continuous in D and (1, 0) D with Re ( ψ(1, 0) ) > 0. Moreover, for all (i u 2, v 1 ) D such that we have { Re ψ(i u 2, v 1 ) = Re = v (1 + u2 2), (1 δ)v 1 (1 σ)h(z) + σ (α 1 + 1) (1 δ)v 1 [ (α1 + 1) (1 σ)h 1 (x, y) σ ] [ (1 σ)h1 (x, y) + σ α 1 1 ] 2 + [ (1 σ)h2 (x, y) ] 2 (1 δ)(1 + u 2 2) [ (α 1 + 1) (1 σ)h 1 (x, y) σ ] 2 [ (1 σ)h 1 (x, y) + σ α 1 1 ] 2 [ + 2 (1 σ)h2 (x, y) ] 2 < 0. Therefore ψ(u, v) satisfies the hypothesis of the Miller-Mocanu Lemma. This shows that if Re ψ(p(z), zp (z)) > 0, (z U), then Re(p(z)) > 0, (z U), that is if f(z) QC p µ(α 1 + 1, β 1, γ, δ) then f(z) QC p µ(α 1, β 1, γ, δ). Using the arguments similar to those detailed above, we can prove the second part of the inclusion. We therefore choose to omit the details involved. Using arguments similar to those detailed in Theorem 2.2, we can prove Theorem 2.4. Let α 1, µ > 0 and 0 γ, δ < 1. Then QK p µ(α 1 + 1, β 1, γ, δ) QK p µ(α 1, β 1, γ, δ) QK p+1 µ (α 1, β 1, γ, δ). }
8 252 C. SELVARAJ and K. R. KARTHIKEYAN 3. Inclusion Properties Involving the Operator L c In this section, we examine the closure properties involving the integral operator L c (f) defined by (23) L c (f) = c z z c+1 t c f(t) dt, (f M, c > 0). 0 In order to obtain the integral-preserving properties involving the integral L c (f), we need the following lemma which is popularly known as the Jack s Lemma. Lemma 3.1 ([4]). Let w(z) be a nonconstant analytic function in U with w(0) = 0. If w(z) attains its maximum value on the circle z = r < 1 at z 0, then z 0 w (z 0 ) = kw(z 0 ), where k is a real number and k 1. Theorem 3.2. Let c, α 1, µ > 0 and 0 γ < 1. If f MS p µ(α 1, β 1, γ), then L c (f) MS p µ(α 1, β 1, γ). Proof. From definition of L c (f) and the linearity of operator I p µ(α 1, β 1 )f we have (24) z(i p µ(α 1, β 1 )L c (f)) = ci p µ(α 1, β 1 )f(z) (c + 1)I p µ(α 1, β 1 )L c (f). Suppose that f(z) MS p µ(α 1, β 1, γ) and let (25) z(iµ(α p 1, β 1 )L c f(z)) 1 + (1 2γ)w(z) Iµ(α p =, 1, β 1 )L c f(z) 1 w(z) where w(0) = 1. Then by applying (24) in (25), we have I p µ(α 1, β 1 )f(z) I p µ(α 1, β 1 )L c f(z) which upon logarithmic differentiation yields z(iµ(α p 1, β 1 )f(z)) Iµ(α p = 1, β 1 )f(z) Thus we have z(i p µ(α 1, β 1 )f(z)) (26) Now, assuming that I p µ(α 1, β 1 )f(z) + γ = c (c + 2 2γ)w(z) =, c[1 w(z)] 1 + (1 2γ)w(z) 1 w(z) (c + 2 2γ)zw (z) c (c + 2 2γ)w(z). (γ 1)[1 + w(z)] 1 w(z) max w(z) = w(z 0) = 1 z z 0 and applying Jack s Lemma 3.1, we have (27) + zw (z) 1 w(z) + zw (z) 1 w(z) (c + 2 2γ)zw (z) c (c + 2 2γ)w(z). z 0 w (z 0 ) = kw(z 0 ) (k 1). (z 0 U),
9 SOME INCLUSION RELATIONSHIPS FOR CERTAIN SUBCLASSES 253 If we set w(z 0 ) = e i θ, (θ R) in (26) and observe that ( [ (γ 1) 1 + w(z0 ) ] ) Re = 0. 1 w(z 0 ) then we obtain ( z0 (Iµ(α p 1, β 1 )f(z 0 )) Re Iµ(α p 1, β 1 )f(z 0 ) ) ( z0 w (z 0 ) + γ = Re = Re 1 w(z 0 ) (c + 2 2γ)z 0w ) (z 0 ) c (c + 2 2γ)w(z 0 2(1 γ)k e i θ ) (1 e i θ ) [ c (c + 2 2γ) e ] i θ ( 2k(1 γ)(c + 1 γ) = c 2 2c(c + 2 2γ) cos θ + (c + 2 2γ) 2 0, which obviously contradicts the hypothesis f(z) MS p µ(α 1, β 1, γ). Consequently, we can deduce that w(z) < 1 (z U) which in view of (25) proves the integralpreserving property asserted by Theorem 3.2. Theorem 3.3. Let c, α 1, µ > 0 and 0 γ < 1. If f MC p µ(α 1, β 1, γ), then L c (f) MC p µ(α 1, β 1, γ). Proof. We observe that f(z) MC p µ(α 1, β 1, γ) zf (z) MS p µ(α 1, β 1, γ) which completes the proof of the Theorem 3.3. = L c ( zf (z) ) MS p µ(α 1, β 1, γ) z(l c f(z)) MS p µ(α 1, β 1, γ) L c f(z) MC p µ(α 1, β 1, γ). Next, we derive an inclusion property which is obtained by using (24) and the same techniques as in the proof of the Theorem 2.3. Theorem 3.4. Let c, α 1, µ > 0 and 0 γ < 1. If f QC p µ(α 1, β 1, γ, δ) then so is L c (f). Finally, we obtain Theorem 3.5 below by using (24) and the same techniques as in the proof of the Theorem 3.3. Theorem 3.5. Let c, α 1, µ > 0 and 0 γ < 1. If f QK p µ(α 1, β 1, γ, δ) then so is L c (f). References 1. Carlson B. C. and Shaffer D. B., Starlike and prestarlike hypergeometric functions, SIAM J. Math. Anal. 15(4) (1984), Dziok J. and Srivastava H. M., Classes of analytic functions associated with the generalized hypergeometric function, Appl. Math. Comput. 103(1) (1999), Hohlov Yu. E., Operators and operations in the class of univalent functions, Izv. Vyss. Ucebn. Zaved. Matematika, 10 (1978),
10 254 C. SELVARAJ and K. R. KARTHIKEYAN 4. Jack I. S., Functions starlike and convex of order α, J. London Math. Soc. 2 (3) (1971), Jung I. B., Kim Y. C. and Srivastava H. M., The Hardy space of analytic functions associated with certain one-parameter families of integral operators, J. Math. Anal. Appl., 176 (1993), Miller S. S. and Mocanu P. T., Differential subordinations and inequalities in the complex plane, J. Differ. Equations, 67 (1987), Cho N. E. and Noor K. I., Inclusion properties for certain classes of meromorphic functions associated with the Choi-Saigo-Srivastava operator, J. Math. Anal. Appl. 320(2) (2006), Cho N. E., Kwon O. S. and Srivastava H. M., Inclusion relationships for certain subclasses of meromorphic functions associated with a family of multiplier transformations, Integral Transforms Spec. Funct. 16(8) (2005), Noor K. I. and Noor M. A., On integral operators, J. Math. Anal. Appl. 238 (1999), Noor K. I., On new classes of integral operators, J. Nat. Geomet. 16 (1999), Ruscheweyh S., New criteria for univalent functions, Amer. Math. Soc., 49 (1975), Yuan S.-M., Liu Z.-M. and Srivastava H. M., Some inclusion relationships and integralpreserving properties of certain subclasses of meromorphic functions associated with a family of integral operators, J. Math. Anal. Appl. 337(1) (2008), C. Selvaraj, Department of Mathematics, Presidency College, Chennai , Tamilnadu, India, pamc9439@yahoo.co.in. K. R. Karthikeyan, R. M. K. Engineering College R. S. M. Nagar, Kavaraipettai Thiruvallur District, Gummidipoondi Taluk Tamilnadu, India, kr karthikeyan1979@yahoo.com.
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