eng Ansari Education and Research Society Journal of Ultra Scientist of Physical Sciences August 2009 21 2 439 442 jusps-A 1206 article O. P. Gupta 1 V. H. Badshah 1 Head of Mathematics Department Star Academy of Technology and Management , INDORE (INDIA) <p>In this paper we prove a unique common fixed point theorem on a closed subset of a Hilbert space. The result presented in this paper is generalize and extended some previously know result.</p> https://www.ultrascientist.org/paper/1206/ Fixed point Hilbert space Banach space Closed subset