Can I ask for criticism or improvement advice for a paper or theory available online?

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Can I ask for criticism or improvement advice for a paper or theory available online?

particular, concise, and self-contained question(Is this known? Can you give a short proof of that lemma? Can you strengthen this statement to...?, etc.), there is a good chance you'll get a meaningful response. Just avoid vague open ended questions of the kind "What do you think of ... in general?" $\endgroup$allwant to prove such conjectures, but are realistic about how likely that is. $\endgroup$