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Erdős problem 955

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If A⊂NA\subset \mathbb{N} has density 00 then s−1(A)s^{-1}(A) must also have density 00.

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The source's own material, retained exactly.

12 retained statements36c6d0fef71a

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FormalConjectures/ErdosProblems/

955.lean

Retained formal statement8 of 12
FormalConjectures/ErdosProblems/955.leanErdos955.s_one1 lineExact file
Erdos955.s 1 = 0
TestStatement only, no proof