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S. K. Tiwari^{1}, R .P .Dubey^{2}, A. K. Dubey^{3}

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Let P be a sub set of Banach space E and P is normal and regular cone on E; we generalize and obtain some sufficient conditions for the existence of common fixed point of multivalued mappings satisfying contractive type conditions in cone metric spaces. Our results unify, generalize and complement the comparable results from the current literature.
Keywords 
Common fixed point, Cone metric spaces, multivalued mapping, Normal cone and non normal cone 
INTRODUCTION AND PRELIMINARIES 
Fixed point theory plays a basic role in applications of various braches of mathematics, from elementary calculus and linear algebra to topology and analysis. Fixed point theory is not restricted to mathematics and this theory has many applications in other disciplines. This theory is closely related to game theory, military, economics, statistics and medicine. Much work has been done involving fixed points for multivalued contractions and none expansive maps using the Hausdorff metric was initiated by Markin [1].Later, an interesting and rich fixed point theory for such maps was developed. Nadler Jr. [2] has proved valtivalued version of the Banach contraction principle which states that each closed bounded valued contraction map on a complete metric space has a fixed point(see also[3],[4],[5],[6],[7]and[8]). 
Quiet recently, Huang and Zhang [9] introduced the concept of cone metric space, replacing the set of positive real numbers by an ordered Banach space. He also gave the condition in the setting of cone metric space. These authors also studied the strong convergence to a fixed point with contractive constant in metric space and introduce the corresponding notion of completeness. Subsequently many authors have generalized the results of Huang and Zhang [9] and have studied fixed point theorems for normal and nonnormal cone (see [10]). S. Hoon .Cho and Mi Sun Kim [11] have proved certain fixed point theorems using Multivalued mapping in the setting of contractive constant in metric spaces and also S. Hoon Cho and J.S. Base [12] proved fixed point theorems for multivalued mappings in cone metric spaces. R. C. Dimri, Amit Singh and Sandeep Bhatt[13] also proved common fixed point theorems for two multivalued maps in complete metric spaces with normal constant M=1. Further, Mujahid Abbas, B.E.Rhoades and Talat Nazir [14] obtained and generalized sufficient conditions for the existence of common fixed points of multivalued mapping satisfying contractive conditions in nonnormal cone metric space.Wardowski [15] introduced the concept of multivalued contractions in cone metric spaces and, using the notion of normal cones, obtained fixed point theorems for such mappings. 
The purpose of this paper is to prove some common fixed point results for multivalued mappings taking normal and nonnormal in cone metric spaces. Our results extend and unify various comparable results in literature [16], [17], and [18] 
Definition 1.1 [9] Let E be a real Branch space and P a subset of E. Then P is called a cone if it is satisfied the following conditions, 
(I) P is closed, nonempty and P ≠ {0}; 
References 
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