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Questions designed to generate a "big list" of certain results, examples, conjectures, etc. via many individual answers, each contributing one or a few instances. Such a question should typically be in Community Wiki mode (CW); after asking, please, flag for moderators attention requesting the question to be made CW.

5 votes

When is 2 qualitatively different from 3?

Here is another example with Gaussian mixture models (GMMs). The landscape of loss for learning a mixture of 2 Gaussians seems to have no bad local optima but that is not the case for a mixture of 3 o …