We construct an infinite family of homotopic but pairwise smoothly non-isotopic symplectic tori in the rational elliptic surface E (1) =P²\#9P². Furthermore, we show that any two of these tori are smoothly equivalent, i. e. , there exists an orientation-preserving self-diffeomorphism of E (1) that carries one torus to the other. Our construction can be generalized for many other symplectic 4-manifolds, for example, the logarithmic transforms E (n) ₘ for integers n, m>1.
B Park (Thu,) studied this question.