Document Type : Research Paper
Authors
1 Instietute of Advanced Studies, Payame Noor University, P.O. Box 19395- 3697, Tehran, Iran.
2 Department of Mathematic, Payame Noor University, P.O. Box 19395- 3697, Tehran, Iran.
3 Department of Pure Mathematics, Faculty of Mathematical Sciences, Shahrekord University, P.O. Box 115, Shahrekord, 88186-34141, Iran.
Abstract
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