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Jul 5, 2020 at 13:10 comment added Stanley Yao Xiao I would like as general a statement as possible; if that's too much to ask then just understanding the case $Q = x^2 + y^2 + z^2 - xyz$ would be great since that will likely help me get a "feeling" for this type of phenomenon.
Jul 5, 2020 at 12:41 comment added Noam D. Elkies You're welcome. For $Q=k$, do you mean thie for the specific case of $Q = x^2+y^2+z^2-xyz$, or any $Q$ satisfying the conditions of your question?
Jul 5, 2020 at 12:17 comment added Stanley Yao Xiao Thank you for your answer. Are there ways to detect when there are "many" fundamental solutions to $Q = k$? Baragar and Umeda gave some examples, but I don't see how to think about this in the general case.
Jul 5, 2020 at 12:14 vote accept Stanley Yao Xiao
Jul 5, 2020 at 4:15 history answered Noam D. Elkies CC BY-SA 4.0