We discuss resonances for Schrodinger operators in whole- and half-line pro
blems. One of our goals is to connect the Fredholm determinant approach of
Froese to the Fourier transform approach of Zworski. Another is to prove a
result on the number of antibound states-namely, in a half-line problem the
re are an odd number of antibound states between any two bound states. (C)
2000 Academic Press.