Dunford–Schwartz theorem

In mathematics, particularly functional analysis, the Dunford–Schwartz theorem, named after Nelson Dunford and Jacob T. Schwartz, states that the averages of powers of certain norm-bounded operators on L1 converge in a suitable sense.

be a linear operator from

Then exists almost everywhere for all

The statement is no longer true when the boundedness condition is relaxed to even

≤ 1 + ε

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