Cohen–Hewitt factorization theorem
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In mathematics, the Cohen–Hewitt factorization theorem states that if V is a left module over a Banach algebra B with approximate left unit {ui}, then an element v in V can be factorized as a product v = bw (for b in B, w in V) whenever lim uiv = v. The theorem was introduced by Paul Cohen (1959) and Edwin Hewitt (1964).
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