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Erdős problem 331

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Let A,B⊆NA,B\subseteq \mathbb{N} such that for all large NN∣A∩{1,…,N}∣≫N1/2\lvert A\cap \{1,\ldots,N\}\rvert \gg N^{1/2}and∣B∩{1,…,N}∣≫N1/2.\lvert B\cap \{1,\ldots,N\}\rvert \gg N^{1/2}. Is it true that there are infinitely many solutions to a1−a2=b1−b2≠0a_1-a_2=b_1-b_2\neq 0 with a1,a2∈Aa_1,a_2\in A and b1,b2∈Bb_1,b_2\in B?

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Problem row
sha256:651b4a0165e42ba9fe25ead9c6f3dfb37bd35fd06bb4cee89dd4df554335296b
Metadata
sha256:a1815657ac15a257d9024b2d8dd42a0cd9d525a56e5ad33b891ef8f1cb072da8
Observation
sha256:9c8326e865b6017b103af7611c852a06776d81964979b8ab5a1b800cd550dff6
Content
sha256:0208edad6afb8b21aaadadf7723520604801416c731786e7a148a21c58621bb2
Repository
sha256:a956b84c437202e5a02cc9e036a621bd14a302b34a75758115730bdbb77c52a4
Projection
sha256:a4a96441668a9f8b33afbcb3f696a2639f5fae145f36ddc063d7f67d5fb87ce8
Source commit
36c6d0fef71a3fec84d9dcd5eeca4e22e378f7cb
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