Updated my MIS blog article with some more details on how Veach defines a one-sample estimator in his '97 thesis and how it relates to the rest of the article: https://lisyarus.github.io/blog/posts/multiple-importance-sampling.html
Demystifying multiple importance sampling

lisyarus blog
@lisyarus FYI a number of the images on that page overflow the body container really awkwardly on narrow (phone) screens. (in case you care about the page looking good on those)
@scherzog Yeah, I gotta do something about it :/

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One day i'm gonna have to learn what all those wacky symbols mean.