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Apr 12, 2018 at 14:06 comment added Yaakov Baruch ... Gowers's...
Apr 12, 2018 at 13:43 comment added Yaakov Baruch @WillBrian: thank you for the pointer to Gower's sensible point. Even though it doesn't answer my question it does manage to reduce the "gap" between problem and solution in a way, by making my question definitely less interesting.
Apr 12, 2018 at 13:33 history edited Yaakov Baruch CC BY-SA 3.0
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Apr 12, 2018 at 13:31 comment added Yaakov Baruch @WillBrian: you are absolutely right!
Apr 12, 2018 at 13:18 comment added Will Brian Tim Gowers's answer here seems relevant: mathoverflow.net/questions/13230/…
Apr 12, 2018 at 13:13 comment added Will Brian I think that in your Q1, you mean for the implication to go the other way. Otherwise it's too easy: of course for any $k$, there are sets of arbitrarily small "size" containing length-$k$ progressions: for example, there are lots of length-$4$ progressions in the set $[10^6,10^6+3] \cup [10^{12},10^{12}+3] \cup \dots$.
Apr 12, 2018 at 13:02 history asked Yaakov Baruch CC BY-SA 3.0