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"Each Positive Rational Number Has the Form φ(m2)/φ(n2)."
Dmitry Krachun, Zhi-Wei Sun (2020)
- Dmitry Krachun, Zhi-Wei Sun:
Each Positive Rational Number Has the Form φ(m2)/φ(n2). Am. Math. Mon. 127(9): 847-849 (2020)
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