We explain how Regge theory and perturbative evolution may be made compatible at small x. The result not only gives striking support to the two-pomeron description of small-x behaviour, but gives a rather clean test of perturbative QCD itself. When x is very small, the proton's gluon distribution function is significantly larger than is commonly believed. Perturbative evolution is invalid below Q2≈ 5 GeV2. © 2002 Elsevier Science B.V. All rights reserved.
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