Positive Integer Solutions of an Equation about Euler Function
For any positive integer n,let φ(n)be Euler function,studied the solutions of the equations φ(xyzw)=2(φ(x)+φ(y)+φ(z)+φ(w)).The concept of the equations about positive solutions and positive solutions of all 32 groups were given,and the 451 groups of all positive integer solutions were given.
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