Abstract
Solutions to the Cauchy problem for the equation iut=Δu+F(|u| 2)u (x∈n, t>0), u(x,0)=φ(x), are considered. Conditions on φ and F are given so that, for solutions with nonpositive energy, the following obtains: There exists a finite time T, estimable from above, such that gradu(t)∥L2(n)→+∞ as t→T. It is also shown that other Lq ‐norms of a solution (including q=∞) blow up in finite time.

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