Dr. Harendra Singh

Assistant Professor & Head,

Department of Mathematics,

Post Graduate College Ghazipur,

(V. B. S. Purvanchal University),

Ghazipur-233001, U.P., India.

Mob. No.: +91-9792383225, 8318342824.

Email- harendra059@gmail.com ; harendrasingh.rs.apm12@iit.bhu.ac.in