That's actually really cool!

Algebra Level 5

α , 2 α , 3 α , and β , 2 β , 3 β , \lfloor \alpha \rfloor,\lfloor 2\alpha \rfloor, \lfloor 3\alpha \rfloor, \ldots \quad \text{ and } \quad \lfloor \beta \rfloor, \lfloor 2\beta \rfloor,\lfloor 3\beta \rfloor, \ldots

Let α \alpha and β \beta be positive irrational numbers such that the sequences above contain every positive integer exactly once. i.e. If you pick a positive integer, it will appear in only one of the above sequences. Which of the following statements are true?

Notation : \lfloor \cdot \rfloor denotes the floor function .

1 α + 1 β = 1 \frac{1}{\alpha}+\frac{1}{\beta}=1 α \alpha , β \beta can only be algebraic irrational numbers β α + α β = 2 \frac{\beta}{\alpha}+\frac{\alpha}{\beta}=2 No such α \alpha , β \beta exists α β = 3 \frac{\alpha}{\beta}=3

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1 solution

Rindell Mabunga
May 10, 2016

https://en.wikipedia.org/wiki/Beatty_sequence

I still do not understand it...

Puneet Pinku - 5 years, 1 month ago

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Yeah me too. Is there anyone who can explain it?

Rishabh Tiwari - 5 years, 1 month ago

Huli ka XD Kilala mo ako?

Manuel Kahayon - 5 years, 1 month ago

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hahahaha xD

Rindell Mabunga - 5 years, 1 month ago

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