How to prove the maintenance of the signal of a specific numerical series?
		
		    Given a1, a2, ..., an positive real numbers, and defined pk = ak \prod { i = 1 to n, i k} [(ai)2 - (ak)2] how to prove that \sum \frac{1}{pi} is positive? I had an idea of proof, but not...		
		
		    
			07 August 2017
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