Guys I know a good post by user t.b. He is on extended leave from MSE, so we can't ask him to post that answer in the blog but I think it deserves to be in the blog. That answer shows the proof of a little known Zabreiko lemma. The advantage of that lemma is that uniform boundedness principle, open mapping theorem, closed graph theorem, bounded inverse theorem and something else can be easily derived from it. Can we post it on MSE blog?
Zabreiko's lemma (from P. P. Zabreiko, A theorem for semiadditive functionals, Functional analysis and its applications 3 (1), 1969, 70–72) is not as well known as it deserves to be and I think it fits the bill to some extent, so let me state that result first:
Lemma (Zabreiko, 1969) Let $X$ ...
@Norbert I am quite out of my league regarding the math involved, but I did review it for grammar. The article looks interesting, now I just have to learn the math for it. :)
I've marked it "pending review" instead of "draft," by the way.
Zabreiko's lemma (from P. P. Zabreiko, A theorem for semiadditive functionals, Functional analysis and its applications 3 (1), 1969, 70–72) is not as well known as it deserves to be and I think it fits the bill to some extent, so let me state that result first:
Lemma (Zabreiko, 1969) Let $X$ ...
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