Published online by Cambridge University Press: 17 April 2009
Suppose that and
. It is shown that any Lp(µ)-valued measure has finite L2(v)-semivariation with respect to the tensor norm
for 1 ≤ p < ∞ and finite Lq(v)-semivariation with respect to the tensor norm
whenever either q = 2 and 1 ≤ p ≤ 2 or q > max{p, 2}. However there exist measures with infinite Lq-semivariation with respect to the tensor norm
for any 1 ≤ q < 2. It is also shown that the measure m (A) = χA has infinite Lq-semivariation with respect to the tensor norm
if q < p.