Using integral formulas based on Green's theorem and in
particular a lemma of Uchiyama, we give simple proofs of comparisons
of different BMO norms without using the John-Nirenberg inequality
while we also give a simple proof of the strong John-Nirenberg
inequality. Along the way we prove the inclusions of BMOA in the dual
of H^1 and BMO in the dual of real H^1. Some difficulties of the
method and possible future directions to take it will be suggested at
the end.
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