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PositiveIntegers

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Domain of positive integers

PositiveIntegers
Reduce[x ^ 2 - 2y ^ 2 == 1, {x, y}, PositiveIntegers] → y == -(Sqrt[-1 + x^2]/Sqrt[2]) || y == Sqrt[-1 + x^2]/Sqrt[2]Simplify[EulerPhi[n]^2 + 1∈PositiveIntegers, n∈ℤ] → Element[1 + EulerPhi[n]^2, PositiveIntegers](x | y | 1)∈PositiveIntegers → Element[x | y, PositiveIntegers]
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ElementSimplifyIntegersNegativeIntegersNonNegativeIntegersNonPositiveIntegersPositiveRationalsPositiveRealsAssumingAssumptionsBooleansComplexes

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