Ji. Diaz et al., ON THE APPROXIMATE CONTROLLABILITY OF SOME SEMILINEAR PARABOLIC BOUNDARY-VALUE-PROBLEMS, Applied mathematics & optimization, 37(1), 1998, pp. 71-97
We prove the approximate controllability of several nonlinear paraboli
c boundary-value problems by means of two different methods: the first
one can be called a Cancellation method and the second one uses the K
akutani fixed-point theorem.